Adblock Plus and (a little) more

Firefox bug disabled all add-ons - including Adblock Plus · 2019-05-04 10:38 by Laura Dornheim

Since late Friday night, an expired certificate caused all add-ons on Firefox to be disabled.
With Adblock Plus being one of the favorite add-ons for users world-wide, this hits us hard. But we have absolute confidence in the open source community behind Firefox to get this fixed as soon as possible!
There is nothing you can or need to do, other than wait for Firefox to update, which will most likely happen automatically.

So in the meantime, stay strong when faced with a pop-up, a screaming flash-ad or an annoying banner while you browse the web.
We will soon be able to block all that for you again!

For technical details on the issue, check Mozillas Bug Report.
You can also follow Firefox on Twitter to stay updated.

Update (May 4th, 10pm CEST): At about 4:15 CEST Firefox started to deploy an update that fixed the issue with the expired certificate, so by now all your add-ons should function again.
If you still have issues with Adblock Plus on Firefox, post a comment or reach out to us on Twitter.

Update (May 5th, 6pm CEST): It seems the fix from Firefox is not working for all. Here are three things you can try:
1. For some users, downloading Adblock Plus through our website adblockplus.org works.
*2.*You could check also Mozillas latest blogpost for possible measures that bring your add-ons back.
*3.*Last but not least: Adblock Plus works smoothly and blocks all annoying ads on Chrome, Safari and Opera!

Comment [152]

  1. artep · 2019-05-04 16:30 · #

    oh yes, I have the same problem. It is most disappointing to have no access to adblock plus. Hope you – whoever – will change this veryvery soon
    artep

    Reply from Laura Dornheim:

    We were holding our breath for some hours, but now Firefox has released an update and everything should be back to normal!

  2. Rick · 2019-05-04 18:08 · #

    Thanks for the update Laura! I thought it was some cynical plot from advertisers to disable a fantastic Adblock Plus product.

    Reply from Laura Dornheim:

    When you know how addicted the internet is to bad ads, that thought isn’t too far fetched… ;-)
    But we do know that is was “just” a mishap and ad blocking on Firefox is back now!

  3. Benoit · 2019-05-04 18:17 · #

    Indeed—good to find this page for confirmation this morning of 04 May 2019…

    Found a work around that seems to work in my environment (Firefox/Mac) from this page:

    https://wiki.mozilla.org/Add-ons/Extension_Signing

    Summary:
    From the FF address field, enter about:config
    Type the following in the search field at the top: xpinstall.signatures.required
    Double click this value to change the ‘value’ to be ‘false’

    Looking at the add-ons from within Firefox now shows a ‘proceed with caution’ status, but it (and other add-ons) work so far.

  4. Peter Braet · 2019-05-04 18:22 · #

    Thank you.
    A workaround in Firefox ESR is to go to about:config, ignore the warning an find xpinstall.signatures.required
    Set “true” to “false” (just doubleclick on it) and all extensions are back. As soon as Firefox fixed this problem I’ll put it back to “true”. I’ll temporally will not download or install anything with Firefox.

    Reply from Laura Dornheim:

    Hi Peter,

    by now, Firefox should have rolled out the fix to all users.
    The work-around you posted was a great help to many but should be used with caution, as you advised. Thanks!

  5. Benoit · 2019-05-04 18:26 · #

    To supplement above work-around involving disabling the xpinstall.signatures.required value:

    Be CERTAIN to reverse this after Firefox has deployed its fix

    Otherwise, you will be vulnerable to installing malicious plug-ins that are unsigned.

    Probably a good idea to simply not install any plug-in with the value set to False.

    Reply from Laura Dornheim:

    Hi Benoit,

    by now, Firefox should have rolled out the fix to all users.
    The work-around you posted was a great help to many but should be used with caution, as you advised. Thanks!

  6. Lloyd · 2019-05-04 19:28 · #

    Adblock Plus is my favorite add-on, so thanks very much for this info!

    Reply from Laura Dornheim:

    Thank you, Lloyd!
    Make sure to tell all your friends about Adblock Plus so they can also surf the web in peace! ;-)

  7. Peter · 2019-05-04 19:57 · #

    Thank you very much, Laura! I figured Firefox, et. al. messed something up, but it’s great to know what it was, and, more importantly, that ABP kept us up-to-date. I truly appreciate all of ABP’ time and effort.
    I absolutely love my Adblock Plus add-on and I will never use a browser without it!!!! – Pete

    Reply from Laura Dornheim:

    Thanks for sharing this Peter!
    Especially on a Saturday, when me and my team jump to work to keep users informed, it makes us happy to hear how much you and others appreciate Adblock Plus!

  8. Jordy (Belgium) · 2019-05-04 20:07 · #

    For a moment I was in advertisement-hell. When you have had Adblock plus for years (like me), you don’t realize the evolution of ads. They have become more agressive and have grown in number to the extreme. What has happened to the internet and how do people without adblock-extensions even survive??
    So, thank you from the bottom of my heart for the quick fix and for the clear communication!

    Reply from Laura Dornheim:

    Hi Jordy,

    thank you so much for sharing your love! We totally agree with you, the internet is unbearable without Adblock Plus.
    We still hope that the internet as some point realizes that this dependency on ads is unhealthy…
    Until then, we gladly block them for you!

  9. Linda · 2019-05-04 20:17 · #

    Thanks for the info on this – it’s a relief to know Firefox will likely have this fixed soon (or so we hope), as we really count on our Adblock Plus! When they do fix it, will we have to manually re-install add-ons such as yours, or will it happen for us automatically (if you know)?

    Reply from Laura Dornheim:

    Hi Linda,

    everything should just work “automagically” once the fix is rolled out to everyone. No need to reinstall!

  10. mbk · 2019-05-04 20:26 · #

    Setting xpinstall.signatures.required to false did not fix it for me. Firefox still shows adblock as disabled and when trying to install from the adblock page Firefox tells me it is corrupt (which I don’t believe). I have version 3.5.2 installed as of April 20th. Firefox version is 66.0.3. Windows 10.

    Reply from Laura Dornheim:

    Hi mbk!

    Are you still experiencing this issue? Try resetting all Firefox settings to default, this should be sufficient for your add-ons and Adblock Plus to run smoothtly again.

  11. Linda · 2019-05-04 20:28 · #

    Just found this important info from Mozilla, which answered my above question about automatic re-installation (supposedly it WILL be automatic):

    https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/

    It also advises that “To provide this fix on short notice, we are using the Studies system. This system is enabled by default, and no action is needed unless Studies have been disabled. Firefox users can check if they have Studies enabled by going to:

    Firefox Options/Preferences -> Privacy & Security -> Allow Firefox to install and run studies (scroll down to find the setting)”

    (I found that studies were not enabled in my Options – just checked the box to allow.)

    Reply from Laura Dornheim:

    Hi Linda!

    Thanks for sharing this here! When I posted the note, Firefox hadn’t provided specifics yet.

  12. Ryan · 2019-05-04 20:34 · #

    ALL OF MY FIREFOX ADDONS have been disabled due to this bug. Lol there is no way this doesnt get fixed soon, or anyone that used firefox with additional plugins for functionality will leave the browser immediately. Im glad that this was the first place I checked because I thought it was my computer, but a serious issue is afoot and for once it isn’t my doing.

    Reply from Laura Dornheim:

    I totally see how you must have felt!
    Glad that this information was helpful for you. And I hope everything works again by now!

  13. Formerly Happily Adfree · 2019-05-04 20:57 · #

    I have happily been using ABP and other things to be almost totally “ad free” for years. Firefox’s infuriating superfluous screwup exposed me to the horrors of Ad Hell for the first time in ages.

    First, Kudos to Laura and ABP for useful, timely information.

    Second, I learned I REALLY appreciate ABP.

    Third, I am breaking down and contributing $$ to give a Big Thanks to ABP.

    Fourth, Please, please give us a way to stop the “Anti-ABP” harassment from web sites that pester us about evading their annoying ads.

    Fifth, THANK YOU ABP!!!!!

    Reply from Laura Dornheim:

    Hey there!

    Thank you so much for your appreciation! Nothing makes us happier than knowing that we have happy users.
    We are fighting hard to make the web as ad-free as possible and hope that we soon get easy options to contribute to content in another way than watching annoying ads!

  14. ezequiel · 2019-05-04 21:19 · #

    I made the mistake of uninstalling it, now I do not allow it!

    Reply from Laura Dornheim:

    Yes, better always keep your Adblock Plus running. We hope Firefox will support it without annoying bugs so you can surf without annoying ads! ;-)

  15. Iceweasel · 2019-05-04 21:29 · #

    The signature workaround doesn’t work for me either. The internet as a whole has returned to be the incredibly ad-infested shit it really is. This is yet another major, super embarrassing cockup that will cost FF and the whole open source crowd a lot of street cred. :( I feel sorry for the ABP people and all other extension developers who are having a hard time too due to this crap. :(

    Reply from Laura Dornheim:

    Thanks Iceweasel!
    Luckily, everything should be back to normal by now.

  16. john · 2019-05-04 22:12 · #

    my ad blocker just stopped working on my old vista 32bit so upgrade to new firefox
    is not on !!! very very annoying !!!!! POOR show from firefox. How DARE they shaft my computer with there STUPID security (ha,ha) precautions

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this.
    We will update this post if there is any specific solution for Adblock Plus users!

  17. tg · 2019-05-04 22:20 · #

    Well, I guess some linux users will have to wait for a full firefox update. The “studies” trick doesn’t work on my linux install, while it does on windows. This won’t help firefox…

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this.
    We will update this post if there is any specific solution for Adblock Plus users!

  18. Peter · 2019-05-04 22:36 · #

    Firefox still preventing ABP for me

    Reply from Laura Dornheim:

    Sorry to hear that, Peter. Unfortunately, we can only wait for Firefox to fix this.
    We will update this post if there is any specific solution for Adblock Plus users!
    Thanks for your patience!

  19. IAN · 2019-05-04 22:41 · #

    Still no adblock.Does the fix include XP?

    Reply from Laura Dornheim:

    Hi there!
    The fix should be rolled out for all operating systems but it seems not to work 100%.
    Unfortunately, we can only wait for Firefox to fix this.
    We will update this post if there is any specific solution for Adblock Plus users!

  20. Peter · 2019-05-04 22:45 · #

    do I need to re install firefox please?

    Reply from Laura Dornheim:

    Hi Peter!
    As informed by Firefox, no re-installation is required. As soon as the fix lands properly, all add-ons should be back to normal.

  21. NMo80054 · 2019-05-04 22:49 · #

    Great. ABP disabled on FF 50.1.0 on WinXP and none of the suggestions work.
    It comes back as ABP either corrupt or disabled. F*cked either way.

    All this guff about “automatic updates”… sure that’s gonna be a lot of help when the fix will only be applied to the latest and greatest FF which is no use to WinXP.

    Firefox should have come with ABP by default.
    Time to move to Chrome, where something actually does work.

    Reply from Laura Dornheim:

    Hi NMo80054,

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. But at least I can assure you that ABP works fine on Chrome.
    We will update this post if there is any specific solution for Adblock Plus users!

  22. Joan Ricks · 2019-05-04 22:58 · #

    My Firefox didn’t update and I’m not seeing anything from them being updated. I’ve tried to download Adblock Plus again but its still telling me the download is corrupt.

    Reply from Laura Dornheim:

    Hi Joan,

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. They informed us, that no re-installation is necessary, but it seems the fix hasn’t reached all users yet.
    We will update this post if there is any specific solution for Adblock Plus users!

  23. Mei · 2019-05-04 23:00 · #

    Nope I can’t use the net without you [AdBlock plus] I actually uninstalled FireFox and am using IE.
    I will keep looking for a corrected FF but ABP wasn’t working on some sites for a while prior to this. But it works great on IE for me.

    Reply from Laura Dornheim:

    Hi Mei,

    glad to hear you found a solution for now!
    Enjoy surfing without annoying ads. ;-)

  24. Desiree · 2019-05-04 23:10 · #

    I read your replies that Firefox should have rolled out updates….but I checked for updates, and Firefox said that there weren’t any. I still can’t get my AdBlock back up and running. Do we still have to wait? Should I uninstall and reinstall Firefox??? It also disabled my Kaspersky anti-virus protection!!!

    Reply from Laura Dornheim:

    Hi Desiree,

    if you can give me more information on which operating system and which browser version you are using I can try to look into it.

    Best,
    Laura

  25. Attila · 2019-05-04 23:14 · #

    None of the setting tweaks did worked for me (Win 8.1/FF 66.0.3), so I have switched browser.

    FF needs to get their sh*t together or will loose lots of users

    Reply from Laura Dornheim:

    Hi Attila,

    I edited your comment a tiny little bit as it feels a little strange to promote competitors on our own site. Hope you understand!
    And yes, we agree, FF needs to work on their issues!

  26. Lucy · 2019-05-04 23:14 · #

    Since this has happened it really hits home how intrusive and annoying ads are.
    I have (again) donated to adblockplus for the incredible work you do to save us from mind-numbing advertising. THANK YOU

    Reply from Laura Dornheim:

    Hi Lucy,

    thank you so much for sharing your love and supporting our work! We really appreciate it!

  27. Edel · 2019-05-04 23:25 · #

    No updates from Firefox as yet and can’t re-install Adblock. Aaaagh! Moving to Chrome methinks after many happy years with FF. Really stupid on their part.

    Reply from Laura Dornheim:

    Hi Edel,

    I totally agree… I guess that’s the difference between open source and a commercial browser.
    Maybe you can switch back soon. Fingers crossed!

  28. Paul · 2019-05-04 23:30 · #

    Can anyone in fact confirm that there has been a fix via Firefox? Like other users here, my version (FF 66.0.3 64-bit for Apple) is still preventing AdBlock from either working or updating—even though their AddOns page literally suggests AdBlockPlus as a replacement. This is painfully, embarrassingly badwork on FF’s end.

    Reply from Laura Dornheim:

    Hi Paul,

    we can only rely on the information from Mozilla. Find their latest blogpost about the issue here.

    Keeping my fingers crossed that you can soon enjoy the internet without annoying ads!

  29. John · 2019-05-04 23:43 · #

    Let me correct that for you: “At about 4:15 CEST Firefox started to deploy an update that fixed the issue with the expired certificate FOR JUST A HANDFULL OF PEOPLE…” but majority of us are still left with NOTHING!!!
    So please take out that worthless update.

    Reply from Laura Dornheim:

    Hi John,

    unfortunately we completely depend on Firefox in regards to that issue…
    Keeping my fingers crossed that you can soon browse the internet without annoying ads!

  30. werdew · 2019-05-04 23:46 · #

    My FF is still defending, does not accept AdBlock.

    Reply from Laura Dornheim:

    Sorry to hear that, werdew. Unfortunately, we can only wait for Firefox to fix this.
    We will update this post if there is any specific solution for Adblock Plus users!

  31. jen · 2019-05-04 23:59 · #

    Hello! Adblock is still not working for me! Im considering getting chrome just to get rid of firefox messing up all the time. When will adblock work again?

    Reply from Laura Dornheim:

    Hi Jen!
    I’m sorry to hear that. Unfortunately, we can only wait for Firefox to fix this, but I can’t tell you when exactly this will be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  32. Warbirdnut · 2019-05-05 00:01 · #

    Firefox 60.6.1 esr on Suse 15 works fine with Adblock. Reinstalling ABP worked.

    Reply from Laura Dornheim:

    Thanks for sharing this Warbirdnut!
    I’m glad you found a solution, maybe this is helpful to others, too.

  33. Jim_Vierling · 2019-05-05 00:05 · #

    Still can not download Adblock Plus.

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this.
    We will update this post if there is any specific solution for Adblock Plus users!

  34. Wayward Son · 2019-05-05 00:21 · #

    I’m running firefox 56.02 64 bit. I haven’t upgraded to 57+ since session manager doesn’t exist for it.

    In any case, as of now, my addons are still disabled.

    Chrome is indeed looking better by the minute…

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  35. Gary · 2019-05-05 00:23 · #

    Can’t download Adblock Plus yet. Or any other add on, for that matter.

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  36. Anon · 2019-05-05 00:43 · #

    ABP for firefox addon is still not responding for me.
    All I get is “could not be verified and has been blocked”

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  37. John · 2019-05-05 00:47 · #

    The only way to fix it (as suggested elsewhere) is to manually install the fix:
    right click this link and save it as *.xpi and than run it with FF
    https://storage.googleapis.com/moz-fx-normandy-prod-addons/extensions/hotfix-update-xpi-intermediate%40mozilla.com-1.0.2-signed.xpi
    and the same with Adblock Plus (if someone has uninstalled this like me)
    right click this link and save it as *.xpi and than run it with FF
    https://eyeo.to/adblockplus/firefox_install/firefox

    Reply from Laura Dornheim:

    Hi John,

    thanks for sharing this!
    This indeed is a working solution but I recommend only users that understand what they are doing to apply this. ;-)
    Best,
    Laura

  38. Moe · 2019-05-05 00:57 · #

    I’m still not seeing my ABP. It’s still blocked. I even tried installing it again but it failed. Checked for update on firefox but it says it’s up to date. I need a solution.

    Reply from Laura Dornheim:

    Hi Moe, I am really sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    They promised that no re-installation would be needed.
    We will update this post if there is any specific solution for Adblock Plus users!

  39. Zer0h1nder · 2019-05-05 01:08 · #

    The Fix is released: in order to install it, you have to activate a firefox setting that can be seen in the following link:
    https://ffp4g1ylyit3jdyti1hqcvtb-wpengine.netdna-ssl.com/addons/files/2019/05/about_prefs.png

    Reply from Laura Dornheim:

    Thanks for sharing, Zer0h1nder!

  40. elvebakj@yahoo.com · 2019-05-05 01:30 · #

    ad block plus still not working for me.

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  41. JeffMakesGames · 2019-05-05 02:30 · #

    Adblock Plus just got disabled in Firefox 66.0.3.

    I tried uninstalling it and re-installing it from the site here but Firefox says the installer is corrupt or something??? So now I have no adblock at all.

    Reply from Laura Dornheim:

    Hi Jeff,

    I’m sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

    Meanwhile, you could try to use Chrome with Adblock Plus. It works perfectly there.

  42. Joe · 2019-05-05 03:03 · #

    I just updated firefox and ADP is not back. Still shows as disabled. What’s going on here?

    Reply from Laura Dornheim:

    Hi Joe,

    I’m sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  43. PeterL · 2019-05-05 03:06 · #

    I am running Firefox 66.0.3 (for macOS) and still getting the error message “the add-on downloaded from this site could not be installed because it appears to be corrupt”. So is this issue fixed or still on-going? Thanks.

    Reply from Laura Dornheim:

    Hi PeterL,

    I can only speculate that the fix wasn’t rolled out to all users at the same time. Do you still have problems?

  44. drk · 2019-05-05 03:12 · #

    For all those saying they still can’t use ABP despite the supposed update, I had to check the “studies” box as described above, and also had to restart Windows 10 and Firefox before ABP started working again. But it now works, and I’m happy about that for sure.

    Reply from Laura Dornheim:

    Thanks for sharing this, drk!
    Hopefully this is helpful to other users!

  45. JeffMakesGames · 2019-05-05 03:30 · #

    I checked the studies box, but it keeps unchecking itself when I close the options.
    Still can’t reinstall Adblock Plus.

    At least I can temporary load the xpi using about:debugging for now…

  46. Michelle · 2019-05-05 04:09 · #

    I also had to click the studies box. There are actually 2 boxes you need to check – see the Firefox instructions here: https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/

    It took a few minutes after I checked that box , but after a short while (I think less than 30 minutes) ABP was on again. I’m waiting for Firefox to do an update so I can uncheck the studies box, but in the meantime this seems to work.

    Reply from Laura Dornheim:

    Hi Michelle,

    thanks for sharing this, hope this also helps other users!
    And I hope even more that Firefox gets this under control!

  47. Mitch San Lauren · 2019-05-05 05:19 · #

    This does not happen in Google Chrome. Stupid Mozilla, they should fire the incompetent people behind this.

    Reply from Laura Dornheim:

    Hi Mitch,

    they can’t as Firefox is mainly created by volunteers that are part of the open source community. ;-)
    While this is super painful, errors are human…
    Fingers crossed they get this under control soon!

  48. Bill · 2019-05-05 05:48 · #

    I still do not have Adblock Plus or any of my other add-ons back.

    I have a dial-up connection because it’s all that I can afford. Since it is an EXTREMELY SLOW connection it is all the more important that I am able to block adds and trackers that slow down my browsing.

    I admittedly do not know a tremendous amount about computers in general. But I’m afraid that because I have such an extremely slow dial-up connection it will take way longer for me to get my add-ons back, if I’m able to get them back at all?

    It already takes insane amounts of time for me to get my Firefox updates due to the dial-up connection.

    Anyone have any advice for me to get my add-ons back? Please keep in mind that I’m far from a computer expert, and I have a dial-up connection.

    Thanks in advance!

    Reply from Laura Dornheim:

    Hi Bill,

    thank you for reaching out!
    In the best case, your add-ons have come back by now, as Firefox started rolling out the fix.

    You can also check this blogpost for more information and tips from Firefox directly.
    There are some settings you can check, they describe step-by-step how that works.

    Good luck,
    Laura

  49. mbk · 2019-05-05 06:02 · #

    Thanks Laura, yes my Adblock Plus is working once again. I’ve been away from the system for a few hours, so not sure when the update occurred.

    Reply from Laura Dornheim:

    Hooray!
    Glad to hear some good news!

  50. kfj · 2019-05-05 06:15 · #

    I’m in the same boat as many….Adblock Plus was disabled. As of tonight, I am apparently not in the batch of the few who got a fix as I’m still not able to download the extension. Get the same error message….‘Download failed. Please check your connection.’

    Reply from Laura Dornheim:

    Sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  51. AMH · 2019-05-05 06:52 · #

    Echoing the above kfj here, and after midnight (so morning of the 5th) for me. Error message is “Download failed. Please check your connection.” Still unable to use add-ons, especially ABP. I’m NOT on dial-up; I’m on a pretty speedy wireless.

    Reply from Laura Dornheim:

    Hi AMH,

    I’m sorry to hear that. Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  52. pangu · 2019-05-05 07:25 · #

    Still unable to re-install Adblock Plus to Firefox 66.0.3 (64-bit)
    Time: 5AM UTC, 1AM NYC
    Date: May 5, 2019
    Windows 7

    Tried following to NO avail
    ABOUT: CONFIG , setting xpinstall.signatures.required to FALSE

    and “Allow Firefox to install and run studies”

    Reply from Laura Dornheim:

    Sorry to hear that! Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

  53. jim st · 2019-05-05 07:40 · #

    I was running fine on version 54 of Firefox, and they broke it with whatever they did. If I upgrade, I lose a lot of plugins I use, so maintain a system with 54 on it specifically for that purpose.

    How the hell did they break an old revision? Can I get a copy of adblock plus, or will you run back thru all the down revs you might have (seem to remember doing that, maybe not with ABP though) so I can get it running?

    I’m about done with firefox, between the destruction of the addon community with their ill guided upgrade and no back compatability to the developers, and now this, I think of the story about the mule and the two by four.

    “That’s Two”

    thanks for this wherever it appears.

    Reply from Laura Dornheim:

    Hi Jim,

    I feel your frustration!
    This is super annoying.

    You can actually find older versions of Adblock Plus in the Mozilla add-on store.

    Hope this helps!

  54. mc · 2019-05-05 07:52 · #

    I can’t get it to add on for me, either. Says check connection. It’s now May 5th at 1:00 a.m. CST Why is this happening? Why is support saying over and over that it should be fixed by now??

    Reply from Laura Dornheim:

    Hi mc,

    I’m so sorry to hear that.
    Unfortunately, we can only wait for Firefox to fix this and have to rely on the information they provide.
    Keeping our fingers crossed that this will soon be the case for all users!

  55. Michel · 2019-05-05 08:14 · #

    ABP still doesn’t show after restarting FF and laptop. Should we just sit and hope that it will be fixed soon? How do we know when it’s fixed for everyone? I do all my important works on FF, and all the ads popping up all over the place is detrimental to my OCD :(

    Please help. Thanks in advance.

  56. Ash · 2019-05-05 08:36 · #

    Hi, my FF has disabled ALL my add-ons, and despite updating my FF, I am still not even able to download ADBlock plus. :-(

    Reply from Laura Dornheim:

    Hi Ash,

    So sorry to hear that!
    Please check Mozillas latest blogpost for possible measures that bring your add-ons back.

  57. Eric · 2019-05-05 09:09 · #

    No update yet for me on any of my systems. FF says its up to date in the about menu.

    Reply from Laura Dornheim:

    Hi Eric,
    So sorry to hear that!

    Please check Mozillas latest blogpost for possible measures that bring your add-ons back.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome.

  58. Ana · 2019-05-05 09:25 · #

    Well, I did not receive that fix file from Firefox even though I had that “Allow Firefox to install and run studies” box ticked since the get go. Is that normal for the fix to be sent to some users, but not to others? It has almost been 2 days and no solution for the problem. Honestly considering moving on from Firefox to Chrome or Opera.

    Reply from Laura Dornheim:

    Hi Ana,

    Really sorry to hear that!

    Please check Mozillas latest blogpost for possible measures that bring your add-ons back.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome.

    However, I hope that Firefox gets this under control soon.

  59. Anon · 2019-05-05 09:26 · #

    Firefox still messed it up and at the weekend i don´t think they bring out a fix.

    I´m running now with TOR. There´s everything working how it should be (Ad-/Scriptblockers and more). :D

    Reply from Laura Dornheim:

    Hi Anon,

    good to hear that!

  60. LadyGreenEyes · 2019-05-05 09:35 · #

    Well, this isn’t actually about the certificates at all; apparently, Firefx has decided to permanently disable AdBlock!! Aong with the classic themes restorer and even Duck Duck GO!! The add-ons page states these are “legacy” add-ons, and no longer valid, as they are “modernizing” the browser. Well, they can do whatever they want with it; I a DONE.

    Reply from Laura Dornheim:

    Hi LadyGreenEyes,

    We are absolutely certain, that Firefox will enable Adblock Plus to fully work again once they have properly fixed this issue!
    Fingers crossed that this will soon be the case…

  61. semaca · 2019-05-05 10:59 · #

    Well, this seems to be “it”, i’ve had enough. I’ll export my bookmarks, back-up the data and put an end to this mockery. Shame on you, Mozilla “developers”. Disgusting ppl.

  62. Annoyed · 2019-05-05 11:27 · #

    Still cant use Adblocker on Firefox for Mac

    Reply from Laura Dornheim:

    We are super annoyed, too!
    By ads in general and this issue in particular.
    Hopefully it will be fixed soon.

    You can also check Mozillas latest blogpost for possible measures that bring your add-ons back.

  63. moi · 2019-05-05 11:30 · #

    Use firefox without adblock+, , no thanks.

    Bye bye…

    Reply from Laura Dornheim:

    Hey moi,

    luckily, there are some other browsers like Chrome or Opera where Adblock Plus works perfectly so you can browse the web in peace!

  64. Otzzi · 2019-05-05 11:57 · #

    It has been almost a day and still my problem persists. When exactly should the fix be deployed?

    Reply from Laura Dornheim:

    Hi Otzzi,

    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    We will update this post if there is any specific solution for Adblock Plus users!

    Meanwhile you can check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

  65. herman · 2019-05-05 12:31 · #

    ABP 4 life yo! love u guys x

    Reply from Laura Dornheim:

    Thanks herman! We love you too!

    Don’t forget to share the awesomeness of Adblock Plus with your friends so they can explore the internet without annoying ads as well! ;-)

  66. ghostrider · 2019-05-05 12:42 · #

    Obviously Mozilla and FireFox have been careless and disrespectful. What reason was there to update a functioning application.

    There is nothing in the world that dictates that I need to use FireFox with Adblocker Plus removed. On to Chrome!

    Netscape user since 1994.

    Reply from Laura Dornheim:

    Hey ghostrider,

    I feel your frustration. Hopefully you can switch back soon!
    The open source community needs all the support it can get…

  67. john · 2019-05-05 13:54 · #

    firefox has disabled adblock plus and all other various adblock extensions in version 66. Wont be using it again unless they are re enabled.

    Reply from Laura Dornheim:

    Hi john,

    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.
    You can check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

    Fingers crossed!

  68. mgenua · 2019-05-05 13:55 · #

    NO ADBLOCK NO NOSCRIPT
    NO FIREFOX will move to different browser

    Reply from Laura Dornheim:

    Hey mgenua,

    I feel you! Luckily, Adblock Plus works smoothly and blocks all annoying ads on Chrome, Opera and other browsers.

  69. Dan · 2019-05-05 13:59 · #

    This is not fixed. Adblock doesn’t work, won’t reinstall because it says the download is corrupted (from the adblock site) or “failed” (Mozilla site). Just saying it “should be fixed” doesn’t help. It isn’t.

    Reply from Laura Dornheim:

    Hi Dan,

    Unfortunately, we can only wait for Firefox to fix this. And rely the information they provide. Keeping our fingers crossed that this will soon be the case for all users.

    You can also check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

  70. ShilohL · 2019-05-05 14:19 · #

    Sunday mornig, May 5, 20219 still not downloadable

    Reply from Laura Dornheim:

    Hi ShilohL,

    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.

    You can also check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

  71. DL · 2019-05-05 14:27 · #

    IT IS STILL NOT WORKING!!! Whatever they claimed to have done, it’s still generating the same error messages, still cannot download it or activate the add-on. Adblock Plus is NOT viable and if so neither is Firefox.

    Reply from Laura Dornheim:

    Hi ShilohL,

    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.

    You can also check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera.

  72. Pete · 2019-05-05 14:49 · #

    Still not working on Sunday 5 5 19. I think they have succumbed to the advertisers threats. trying to find another browser that will block all extremely annoying ads. Unfortunately they all have issues of one sort or another.

    Reply from Laura Dornheim:

    Hi Pete, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera. ;-)

  73. Claude · 2019-05-05 14:55 · #

    With Firefox for years will end on Monday if AD still banished, other browser exits !…

    Reply from Laura Dornheim:

    We are absolutely certain, that Firefox will enable Adblock Plus to fully work again once they have properly fixed this issue!
    Fingers crossed that this will soon be the case…

  74. Carl · 2019-05-05 15:03 · #

    I don’t believe for a second that this was a bug. If it was a bug, I would be able to go to the Adblock Plus home page and reload the software, while the signature requirement is disabled. The fact that it says the file is corrupted, is pure horse hockey. What are the chances of the file being corrupted at the same time as the so called bug is active? In my opinion, slim and none. Also, older versions of Firefox that are no longer supported were also hit, so did they out of the goodness of their hearts try to update the older versions too, even though that feature is disabled? Seems funny to me. And no, it is still not fixed for me on two different platforms.

    Reply from Laura Dornheim:

    Hi Carl,

    We are absolutely certain, that Firefox will enable Adblock Plus to fully work again once they have properly fixed this issue!
    Fingers crossed that this will soon be the case…

    So hopefully, there aren’t any evil forces behind this!

  75. andy · 2019-05-05 15:16 · #

    ABP still not working on Firefox 5/5/19 morning. Is there a way to force the Firefox certificate update mentioned above? Aside from restarting computer, which I did.

    Reply from Laura Dornheim:

    Hi Andy,

    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.

    You can also check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

  76. Mxyzptlk · 2019-05-05 15:24 · #

    NOPE! “Firefox is up to date” 66.0.3 and AdBlock+ is still BUGGERED.

    Reply from Laura Dornheim:

    Hi there.
    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.

    You can also check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

  77. Vance · 2019-05-05 15:35 · #

    Sunday, 9:30 Eastern Time. Adblock still scuppered. Getting a bullshit error message “Download failed. Please check your connection.” Yuh, riiiiight.

    If this isn’t resolved in the next 48 hours, the conversation needs to turn to other browsers that support Adblock Plus.

    Thanks!

    Reply from Laura Dornheim:

    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.

    You can also check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera.

  78. liz · 2019-05-05 15:50 · #

    I still can’t download adblock or any other ad blocking extension. Says they are all corrupt . Really? I’ve been using Firefox for years, but this is a deal breaker. I’ll have to go with Chrome until you guys can fix this.
    Also if you answer with directions to check a certain box, please thoroughly explain where to find it. ( I’ve wasted enough time looking for a “studies “ box )

    Reply from Laura Dornheim:

    Hi Liz,

    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.

    You can also check “Mozillas latest blogpost”:https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ for possible measures that bring your add-ons back.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera!

  79. werdew · 2019-05-05 15:56 · #

    At the moment, using FF is a wasted time. Thousands of ads everywhere. I will use a different browser until FF does not fix “error”
    It is sad.
    FF should be ashamed.

    Reply from Laura Dornheim:

    Hey werdew,

    unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users.

    And totally, the web full of ads is not bearable if you have ever experienced it with an ad blocker.

    But yes, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera.

  80. Andrew Lloyd · 2019-05-05 16:01 · #

    My Adblock Plus is still not functioning. Is there something I need to do?

    Reply from Laura Dornheim:

    So sorry to hear that!

    You can check Mozillas latest blogpost for possible measures that bring your add-ons back.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera.

  81. Charlene · 2019-05-05 16:04 · #

    I’m still unable to use AdBlock Plus.

    Reply from Laura Dornheim:

    So sorry to hear that!

    Please check Mozillas latest blogpost for possible measures that bring your add-ons back.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera.

  82. Bob · 2019-05-05 16:10 · #

    Firefox now tells me I must upgrade to 52 or later but then Firefox does not support Web Components add on. ARG

    Reply from Laura Dornheim:

    Totally feel your pain!
    Unfortunately, we can only wait for Firefox to fix this. Keeping our fingers crossed that this will soon be the case for all users and all versions.

    Meanwhile, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera…

  83. Harrison · 2019-05-05 16:34 · #

    Checked the Studies as advised by Firefox and their “fix” shows in the Completed (not Active). Firefox says the “fix’ only applies to desktops but most of us have laptops. Why is there no fix for laptops?

    Reply from Laura Dornheim:

    Hi Harrison,

    I assume they include desktops in that definition. (As opposed to mobile devices…)
    But I can only speculate.

    Please check Mozillas latest blogpost for possible measures that bring your add-ons back.

  84. EllBee · 2019-05-05 16:54 · #

    After reading the many comments, I took a stab at downloading AdBlock Plus from the AdBlock site and it seems to be working. Hopefully it will continue to work! Thank you for this response forum from your devoted users!

    Reply from Laura Dornheim:

    Thank you EllBee!
    Hope this also helpes some others.

    Enjoy the internet without annoying ads!

  85. C. Hickox · 2019-05-05 16:59 · #

    Still trying to reinstall ABP with no luck. Must I go over to dreaded Internet Explorer? The supposed fix has yet to reach my laptop. What gives?

    Reply from Laura Dornheim:

    Hi there!

    Sorry to hear that…

    For some users, downloading Adblock Plus through our website adblockplus.org works.

    You could check also Mozillas latest blogpost for possible measures that bring your add-ons back.

    Last but not least, Adblock Plus works smoothly and blocks all annoying ads on Chrome and Opera.

  86. PBJ · 2019-05-05 17:15 · #

    Trying to download adblock plus after plugin stopped working, I get an error message that says Firefox can’t download the plugin because it’s corrupted. Also working on a laptop. Maybe will have to use Chrome or Safari until this gets fixed?

    Reply from Laura Dornheim:

    Hi PBJ,

    For some users, downloading Adblock Plus through our website adblockplus.org works.

    You could check also Mozillas latest blogpost for possible measures that bring your add-ons back.

    Last but not least, Adblock Plus works smoothly and blocks all annoying ads on Chrome, Safari and Opera.

  87. RAD · 2019-05-05 17:18 · #

    When I try to download from the Adblock site, I get an error message that says it can’t be downloaded because it is corrupt. (I have Windows 7.)

  88. Justin · 2019-05-05 17:18 · #

    I will not be using firefox ever again; I am tired of their sanctimonious garbage anyway. So glad your addon works on Chrome. I think it would be worth your time to get some people to help you jack the Mozilla code and fork your own browser so this kind of thing doesn’t happen again.

  89. Darcy · 2019-05-05 17:49 · #

    I’ve done everything suggested both here and on FF’s site. I even finally succumbed to the pop up nag and updated the browser. The weird thing is – something still seems to be blocking ads. I use a couple ad heavy sites and specifically got ABP so I could read these sites without being harassed. I’m still not seeing ads on those sites. Then there is one specific news outlet that started refusing to allow me access unless I “turned off your ad blocker.” I just followed a link to that site and got the same denial telling me to turn off the ad blocker or whitelist them. So, even though the ABP icon is no longer displayed in FF, it does seem to be working. I’m still thinking of doffing FF for good and all though. No one should have to waste hours dissecting their constant glitches for a cure.

  90. Anon · 2019-05-05 17:55 · #

    Hi folks

    Got a solution for the moment until Firefox fixes their mess.

    Just download this fix with Firefox, accept to install it and all of your add-ons should be turned on again (maybe some have to activated manually), but it´s possible not everyone helps it. So you´ve got to wait.

    Link:
    https://storage.googleapis.com/moz-fx-normandy-prod-addons/extensions/hotfix-update-xpi-intermediate%40mozilla.com-1.0.2-signed.xpi

  91. badsector · 2019-05-05 18:29 · #

    Nothing works to restore ABP. I’d never really used Chrome, but since it is blocking ads, gave it a try and will use it until FF gets more trustworthy.

  92. Festus · 2019-05-05 19:02 · #

    This is another in a LONG list of stupid things the powers-that-be at Mozilla have done! They are nothing more than a group of idiots. Always tweaking things for the sake of change. DUMBING THINGS DOWN and down and down. When will they EVER learn to leave well enough alone and STOP EFFING THINGS UP??? ADP still not working for me.

  93. The Wraith · 2019-05-05 19:54 · #

    Surfing on the web I found a workaround to the issue. It’s cumbersome since you have to install ABP EVERY time you restart Firefox, but for the time being is a ‘solution’.

    - when trying to download ABP, right click the button and choose ‘Save As’ in order to save the .xpi file

    - open the about:debugging#addons page of Firefox

    - press the ‘Load Temporary AddOn’ button and choose the .xpi file you just saved

    Now ABP works again… until you close the browser. But since you have already downloaded the .xpi, you only have to add it manually to the debugging page again

  94. John · 2019-05-05 19:57 · #

    still no change my ad blocker lite hasnt came back, is there is it going to happen or what

  95. Firefox hater · 2019-05-05 20:18 · #

    Still not fixed.

    Looks like it is time to find a better browser…

  96. Rich · 2019-05-05 20:53 · #

    I have two Macs with the Firefox ABP glitch. One, running MacOS 10.13.6, has corrected itself, all AddOns working again. Firefox prefs had “automatic” updates set.

    The other Mac, running MacOS 10.11.6, has all AddOns working again EXCEPT ABP. Firefox prefs had “Auto-download but Manual installation” of updates set. Tried updating, but no worky. Still indicates I have latest version installed.

    Both Macs show Firefox v. 66.0.3 running. Was Firefox’s FIX a “stealth” auto-update w/o version number, or was it v. 66.0.3?

  97. Anon · 2019-05-05 21:11 · #

    Just to say this post ( #90) Anon · 2019-05-05 17:55 and it’s link worked for me . . . .

    ——————————————————————————————————————————————————————-
    Hi folks

    Got a solution for the moment until Firefox fixes their mess.

    Just download this fix with Firefox, accept to install it and all of your add-ons should be turned on again (maybe some have to activated manually), but it´s possible not everyone helps it. So you´ve got to wait.

    Link:
    https://storage.googleapis.com/moz-fx-normandy-prod-addons/extensions/hotfix-update-xpi-intermediate%40mozilla.com-1.0.2-signed.xpi

    —————————————————————————————————————————————————————————
    Not only did ABP come back to life with my original settings, so did my other couple of add-ons that stopped due the bug.

    Hope it’s legit and not malware or something, though PC is clean so far.

  98. Bob Jones · 2019-05-05 22:00 · #

    This is terrible.
    Advertisements. invading. every. orifice.
    Send help.

  99. Fireflux · 2019-05-05 22:25 · #

    It’ll be interesting to see whether or not the devs manage to fix this problem across all versions of Firefox, or if everyone will be forced into updating to the latest version once this is solved. There are legions of us who’ve never updated due to the problems users continually face regarding addons. I would like to update if for no other reason than to be more secure, but like so many others this would mean losing nearly all of my current extensions.

    Best guess? The certificate expiring revealed and unforeseen bug in ALL versions of Firefox, one which they’re probably having real trouble fixing from the looks of it. So glad there are other options out there when it comes to browser choice!

  100. Rich · 2019-05-05 22:27 · #

    Found a fix for me on the Mozilla support site as quoted below. I’ve added clarification for Macs in parenthesis. Involves a simple change in your Firefox Options/Prefs:

    “Mozilla has rolled-out a fix for this. The fix will be automatically applied in the background within the next few hours, you don’t need to take active steps.

    In order to be able to provide this fix on short notice, they are using the Studies system. You can check if you have studies enabled

    1. Go to [=](File) > Options (Preferences) > Privacy & Security > Firefox Data Collection and Use. 2. Make sure Allow Firefox to install and run studies is check marked.

    If you had it disabled, you can disable studies again after your add-ons have been re-enabled.

    They are working on a general fix that doesn’t need to rely on this and will keep you updated.”

    This instantly fixed my problem as described in #96. Hope it helps you too.

  101. update to solve · 2019-05-05 23:04 · #

    Update firefox to version 66.0.4 to solve this problem. all my addons work now

  102. simpleton · 2019-05-05 23:08 · #

    simple solution click help then about and finally click restart firefox to update

  103. Bernice · 2019-05-05 23:23 · #

    I followed your advice just now and updated Firefox and Adblock is back as it was before all this started,…..thank goodness.

  104. 104 · 2019-05-06 02:09 · #

    I can also verify that if you update Firefox to version 66.0.4 addons will return

  105. Johnny B · 2019-05-06 02:14 · #

    I got the notice about it being disabled and, like a dummy, I went and removed it. Now it won’t let me download or re-install it, or ANY other add-ons. Is there a way to download the add-on file from your site and do a manual install?

    Thanks

  106. Jason · 2019-05-06 03:04 · #

    Firefox v66.0.4 on 5/5/19 has resolved the issue. The issue also affected Ghostery and FB Purity addons. All is well now with my Adblock Plus!!!

  107. MLCastellanos · 2019-05-06 05:34 · #

    I suppose I’m screwed. I still use WXP and according to Mozilla, it’s no longer supported.

  108. werdew · 2019-05-06 07:34 · #

    After upgrading to the latest version, FF still receive the message “Download failed. Please check your connection.” when I try to reinstall ABP.

  109. jim st · 2019-05-06 08:08 · #

    Any idea how this broke the plugins for use on 54 and 55 versions of Firefox, and whether there is a fix for that.

    your previous suggestion, which was to go to the prior versions page (thanks for that link) shows all the versions corrupt.

    When I go with my 54 browser to the current addon for adblock plus, it shows the add to firefox button, but then fails with a message that your plugin is corrupt.

    what is going on with this, I have not changed my browser, nor do I wish to, as all the older plugins, besides yours break.a

    i’m very close to venting on Firefox and these people very incompetent work going on here.

  110. mozilla.org · 2019-05-06 08:17 · #

    An updated version of Firefox is available to address the issues with Add-ons disabled or fail to install on Firefox. You can download the update for your OS here: https://www.mozilla.org/firefox/new/ For Known Issues and Workarounds, please check out the update at https://support.mozilla.org/en-US/kb/add-ons-failing-install-firefox

  111. NeverchangewhatisOK · 2019-05-06 10:26 · #

    YOU DO NOT HAVE TO UPDATE FIREFOX FOR THE ADD-ONS TO WORK AGAIN.
    THE TIP IN POST 37, REPEATED IN POST 90, WORKS!
    You do not even need to install the fix manually from the downloaded xpi file.
    Simply put the address of the fix below in the Firefox address bar.
    https://storage.googleapis.com/moz-fx-normandy-prod-addons/extensions/hotfix-update-xpi-intermediate%40mozilla.com-1.0.2-signed.xpi
    After installing the fix, go to the menu, tools, add-ons and from either the extensions tab or unsupported tab update Adblockplus.
    For those who have an up to date Adblockplus and may therefore not be able to update it, downloading it again from https://adblockplus.org should work as well.

  112. Annoyed · 2019-05-06 10:48 · #

    Checked Mozilla page – said fix is to download FF 66.0.4 – updated to this version and now seems to be blocking. Tentatively optimistic this might have been fixed

  113. werdew · 2019-05-06 12:36 · #

    FF version 66.0.4
    ABP works as it should.
    It looks like the problem has been solved.
    Again, I can enjoy any webside without ads.
    ABP the best.

  114. ivanovar-08 · 2019-05-06 13:21 · #

    FF version 54.0
    Nothing works and fix ain’t no helping. Attempts to install AD Block plus result in “file is corrupt” error. Not willing to update to 66.0.4 as many other addons I used are “legacy” and incompatible with it.

  115. Jerry · 2019-05-06 13:38 · #

    I’m unable to get AdBlock to work on Firefox any more. Back to Safari or Chrome.

  116. john · 2019-05-06 13:51 · #

    Extensions are now back and briefly showed up in the address bar but then didnt and still dont. They are enabled in the extensions list but dont show up in the address bar at the top of the page where they always used to. Not showing in private tab option either. Strange.

  117. Ronnie · 2019-05-06 14:25 · #

    Still no sign of Ad Block and not able to download/reinstall.

  118. nbwriter · 2019-05-06 14:34 · #

    Dear FF Users,

    Here’s a fix for this annoying problem that’s working for me (in Firefox 65.0 64Bit)

    You go to adblock plus addon website as normal:
    https://addons.mozilla.org/en-GB/firefox/addon/adblock-plus/

    RIght click over the big blue button > Add
    Save this file to your desktop: adblock_plus-3.5.2-an+fx.xpi
    Open a new tab in Firefox : enter > about:debugging
    Click the ‘Load Temporary Add-on’ button (on the firefox debugging page)
    Navigate (on your PC hard drive) to the .xpi file you just downloaded
    Open it and you will see ABP icon appear in the Firefox Toolbar (it installs fast)

    Job done: If someone clever enough to automate these steps reads this, I’d be grateful
    if you leave a way to do that below (I think it can be done with javascript, but I’m no
    expert at JS coding, sorry) Personally, this is a big pain in the neck: And the solution seems too slow coming… I’ll just migrate to another browser if FF keep this up, the whole point of using FF is due to its great addons…

    Regards NB

  119. Diz · 2019-05-06 17:15 · #

    While looking at this thread, I was finally able to get it to install!

  120. RR · 2019-05-06 18:04 · #

    Here is a fix that works for versions 56.0-2 and prior

    https://www.reddit.com/r/firefox/comments/bkspmk/addons_fix_for_5602_older/

    I refuse to move past FF 56 and lose my add-ons.
    Mozillas fix does not work for older versions
    This fix did

  121. Kiki · 2019-05-06 20:03 · #

    I enabled the nosy thing they said would fix it. It didn’t. I don’t know if they were successful in downloading the crap I didn’t want, since I have very very very little bandwidth. That means I’m having trouble getting my email in Firefox because all those ads want to load. And I can’t easily download AdBlock Plus again — which, by the way, at some point we were told NOT to do, just wait, they’ll fix it.

    And NOW — Firefox would not even let me view this page, which I could access via Firefox yesterday! I had to go to Chrome to try to catch up on what’s happening! When I tried to access https://adblockplus.org/blog/firefox-bug-disabled-all-add-ons-including-adblock-plus, Firefox said:
    **************
    An error occurred during a connection to adblockplus.org. The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem.
    Learn more…
    Report errors like this to help Mozilla identify and block malicious sites
    ******************
    Um, yeah. At this point, Mozilla, you’re the malice.

  122. Rob · 2019-05-06 20:28 · #

    You keep saying “back to normal by now” but it is not. I saw Ad blocker for a minute, then it was gone. Firefox even suggested I refresh it, which I did. It changed my settings which annoyed the hell out of me, but still no ad blocker. I think this is intentional by Firefox, to get people to look at ads for several days while claiming its some bug. Money makes the wordl go round, and I know many companies are ticked off by ad blocking add ons. Coincidence? Hardly.

  123. bruce · 2019-05-06 23:20 · #

    Go to menu click help update fire fox and all your add-ons will be back

  124. Marion · 2019-05-07 00:03 · #

    Thank you Bruce! This fixed the problem for me. Adblock Plus is back on. Yay!

  125. Fireflux · 2019-05-07 01:31 · #

    Thank you for posting that Reddit link, RR! Updating the certificate with the one taken from Mozilla’s own XPI fix worked for me, or at least until it expires again in 2025, lol!

    Here is the link once again, just in case someone needs it:

    https://www.reddit.com/r/firefox/comments/bkspmk/addons_fix_for_5602_older/

    My Firefox version is 51.0.1 in case anyone is wondering. Thanks so much once again! So glad to have Adblock working again!

    Reply from Laura Dornheim:

    Hey Fireflux

    thanks for sharing this and thanks for spreading the love! May your favorite adblocker never leave you again. ;-)

  126. goga · 2019-05-07 03:11 · #

    IF you not allow use us Adblock you will lost lot of costumers Cheers

  127. carlo_s · 2019-05-07 09:00 · #

    Adblock Plus working on Firefox ver. 66.0.4 :) Thanks so much :)

    Reply from Laura Dornheim:

    Yes! Happy to hear that.
    Let us know if you ever need any support with Adblock Plus!

  128. mick · 2019-05-07 11:41 · #

    I’ll never upgrade to Firefox Quantium because it gives Mozilla total control over your browser. Add ons can now be disabled by remote, or out of date cert. Sigh!

    Cliqz, Mr Robot debarcle, this flawed add on signing was leading up to this cluster “F”. Mozilla continues to ignore their users base concerns. (HaHa).

    Thank God! I stayed with the forked firefox versions, blocked mozilla’s rancid ip addresses.

  129. Paul W. · 2019-05-07 14:04 · #

    Around 7:00 Eastern last night, I got a Firefox “Quantum” update to version 67.0b17. Now, Adblock Plus (and Ghostery) are listed, once again, in my add-ons list, but neither are functional. Also, there is no icon for either in the navigation bar. I can not visit my preferred news site without Adblock Plus, so I must shift to Opera. I will give Mozilla until tomorrow morning to get their act together.

    Reply from Laura Dornheim:

    Hey Paul, so sorry for all this. I wish Mozilla would have this sorted now! Thanks for switching to Opera and keeping the browser market divers!

  130. JFL · 2019-05-08 14:56 · #

    Hotfix by Mozilla can’t reasonably help XP users, since XP is no longer supported. Adblock still disabled on my computer under XP and running Firefox ESR 52.9.0 :( :( :(
    Found no working workaround or is there ??

    Reply from Laura Dornheim:

    Hi JFL, unfortunately I am not aware of any fixes for your set-up. Sorry!

  131. mick · 2019-05-09 02:31 · #

    windows xp users, waterfox, firefox esr 52.9.0, users (old firefox versions) type in the url bar, “about:config” (without “).

    type in the search bar “xpinstall.signatures.requred” (without “).
    clicking on it will change it to false, restart firefox.

    Your add ons will be working. Enjoy.

    Reply from Laura Dornheim:

    Hey Mick, thanks for sharing this fix! I dared to correct your typo, hope it helps others!

  132. BillV · 2019-05-09 04:31 · #

    Thank you for all this. I just discovered it after wondering why I was suddenly seeing ads for malware (DOCtoPDF.io, Manualslibrary.org, and pdfmaker.live). I’m an XP user and couldn’t download any ad blocker from Mozilla today, kept getting a message about download failed or something. For the time being, I’ve switched to Chrome (unsupported). But I may give the above ideas a try if it goes on for long as Chase online banking won’t allow access by old versions of Chrome.

    Reply from Laura Dornheim:

    Glad that you found some useful information here, BillV!

  133. BillV · 2019-05-09 04:52 · #

    P.S. I just checked out mick’s fix in #131 above. It won’t work as stated because he misspelled “required”. You must enter “xpinstall.signatures.required” (without “) or the search will fail. Otherwise seems OK but, as I stated above, I haven’t actually done so for now.

  134. eddietrix · 2019-05-09 11:09 · #

    Thanks firefox, i moved back to google chrome, it loads sites faster anywhay. I use adblockplus since years. And suddenly websites became miserable, its horrible.

    Reply from Laura Dornheim:

    Sorry to hear that but luckily Adblock Plus works perfectly on many other browsers!

  135. mick · 2019-05-10 08:56 · #

    Laura Dornheim & BillV.

    Thank you, for pointing out my typo. Mental exhaustion! Conscripted into “Add on Technical Support” for friends and family.

  136. mick · 2019-05-10 09:20 · #

    “Firefox.settings.services.mozilla.com” is serial add on killer. Thanks to Wireshark, if this url connects to your browser, your add ons become dead as a door nob.

    Another one for the hostfile (127.0.0.1 Firefox.settings.services.mozilla.com).

  137. Richard · 2019-05-10 09:54 · #

    Mine is still not working. I have even tried removing it and reinstalling but no luck. When clicking the “add to Firefox” button I get an error “download failed. check your connection”. My connection is working fine as I can get to the download page but cannot install the addon. Same issue with other addons too.

  138. zach · 2019-05-10 14:37 · #

    ALso for mine:
    1.from the mozila page i getr te same wrror : “check your connection “
    2.gong to adblock the “install file is corrupt “
    Mozilla must do something very fast , or i will stop using my computer in favor of my tablet

  139. zach · 2019-05-10 14:46 · #

    THis is the mesage i get once i made the process with Debugging :

    Reading manifest: Error processing background.persistent: Event pages are not currently supported. This will run as a persistent background page. Reading manifest: Error processing minimum_opera_version: An unexpected property was found in the WebExtension manifest. Reading manifest: Error processing storage: An unexpected property was found in the WebExtension manifest.

    Irun the latest version 57.0 64b

  140. zach · 2019-05-10 14:49 · #

    THis is the mesage i get once i made the process with Debugging :

    Reading manifest: Error processing background.persistent: Event pages are not currently supported. This will run as a persistent background page.
    Reading manifest: Error processing minimum_opera_version: An unexpected property was found in the WebExtension manifest. Reading manifest: Error processing storage: An unexpected property was found in the WebExtension manifest.

    Irun the latest version 57.0 64b

  141. Rose Marie Stevenson · 2019-05-10 16:56 · #

    As of May 10 10:55am EST I went to adblock site to re-download. Got msg from firefox that the file was corrupted and would not permit download

  142. Stuart Van Tine · 2019-05-10 18:50 · #

    Adblock seems to be working. It blocks ads. But I keep getting an update installation complete message, and my whitelist gets erased. This happens two or three times day.

  143. Tom Brooks · 2019-05-11 02:10 · #

    Still getting the same crap from Firefox when trying to REinstall Adblock Plus. File is corrupted, connection reset, blah blah blah. I cannot handle dealing with YouTube or anything without Adblock Plus. This misery makes me realize how much I took it for granted! Firefox screwed the pooch on this one. Switching to Chrome at least until they sort things out.

  144. allan · 2019-05-11 03:55 · #

    FF upgraded to 66.0.5 on 9th.
    FF notice to disable ABP and restart FF at 9:30 p.m. of 10th.

    Wanted info, found this page.
    I run several blockers, and security app’s.
    Few problems. Luck, or applications, either way, fewer headaches .
    I use FF and MSIE most. May as well try others.
    Meanwhile Malwarebytes has been intercepting items.
    Invasion attempts stop when I close FF.

    Cheers……allan

  145. mick · 2019-05-13 04:33 · #

    Download the portableapps Firefox version, the program runs a seperate profile. Allowing the user to run two different Firefox installation on the same machine.
    Bad news! Users need to install their add ons again, a small price to pay, and you can install it on a usb drive.

    portableapps.com

  146. Mike · 2019-05-13 19:10 · #

    Still not working here(13th May). cannot install adblock plus into Firefox, it says file is corrupt.

  147. mick · 2019-05-15 12:14 · #

    Updating to Firefox Quantium has left many up “Sh*t creak, without any add ons”.
    Your browsers needs to checkin every 24 hours to keep your add ons alive. its time to search for a new browser!

    The Mozilla execs come from an advertising background, your add ons cease to function! work it out!!

    Ps. Waterfox68(quantium without the bullsh*t), Waterfox56, Palemoon, Balsilisk, Brave browsers. Many more to choose from.

    Reply from Laura Dornheim:

    Hey Mick,

    thanks for writing!
    I guess you understand that we like to promote browsers that support Adblock Plus here, so I too the liberty to remove your list.
    Opera or Safari for example have no strings to the advertising industry and ABP works smoothly there.

  148. Sid · 2019-05-20 07:50 · #

    It’s the 19th of May now, Firefox STILL hasn’t fixed their problem with AdBlock Plus. I had temporarily switched to Chrome so I could still use it… looks more and more like that switch might end up being permanent.

  149. MichalM · 2019-05-20 11:45 · #

    I just say F*** YOU Mozilla !

  150. MichalM · 2019-05-20 11:55 · #

    Bye Mozilla and hello to WATERFOX <3
    (because it is not only AdBlock plus, but also my favorite TabMixPlus extension, they f***** up)

  151. Sigh · 2019-05-20 20:17 · #

    My Addblock plus addon still does not work.
    My Addblock plus addon still does not work. 2 Other addons do.
    Isn’t there a manual fix that would work for Firefox version 56.01?

  152. roy · 2019-05-22 10:24 · #

    everything is working fine but one thing I am pissed of that whenever I am opening cyberflix tv firestick in firefox it is showing too many ads and I am really frustrated

    Reply from Laura Dornheim:

    Hi Roy!

    I know how annoying that is!
    Did you know that you can report ads that aren’t getting blocked through your Adblock Plus extension?
    Just click on the logo and it will show you “Report Issue” as an option. This helps our filter list authors to improve the block lists!

    Thank you!

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