The plan towards offering Adblock Plus for Firefox as a Web Extension · 2017-04-12 08:23 by Wladimir Palant

TL;DR: Sometime in autumn this year the current Adblock Plus for Firefox extension is going to be replaced by another, which is more similar to Adblock Plus for Chrome. Brace for impact!

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New data storage in Adblock Plus for Firefox · 2017-04-11 11:42 by Wladimir Palant

As of Firefox 57, classic extensions such as the current Adblock Plus for Firefox will no longer load and only Web Extensions will be allowed to continue working. In order to prepare for the transition, starting with Adblock Plus 2.8.2.4244 development build we will use Web Extensions for data storage. Any existing data (this includes both current filters/subscriptions and automatic backups) will be taken over automatically and ideally there should be no visible changes at this point. However, the data will no longer be stored in the adblockplus/patterns.ini file of your Firefox profile but rather in the browser-extension-data/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/storage.json file.

Please tell us about any data loss issues you encounter after this change. We are moving towards releasing Adblock Plus 2.9 which will start data migration for our entire user base. Note that the format of the Web Extensions storage is still supposed to change which will hopefully make it more robust and performant.

To the install page

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Do you #blockbetter? Tell us how and win a smartphone of your choice! · 2017-03-28 14:00 by Björn Loesing

We know there are a million reasons to use Adblock Plus with the Acceptable Ads program, but what we really want to know is yours!

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Celebrate and share a safer Internet with us today! · 2017-02-07 10:05 by Björn Loesing

Did you know today is the official Safer Internet Day? No? Well, now you do! Today is about celebrating all the accomplishments we have achieved in the past years to make the Internet a better and safer place for everyone.

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Why you will always have a choice to switch off Acceptable Ads, and why you shouldn’t - an opinion piece · 2016-12-14 14:46 by Björn Loesing

The advertising business in general has gone down the wrong rabbit hole. It’s all about getting clicks. To find out why the Acceptable Ads initiative is the most sensible choice despite all of this, read more in this personal opinion piece.

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Adblock Plus 2.8.2 for Firefox released · 2016-11-22 18:17 by Wladimir Palant

Install Adblock Plus 2.8.2 for Firefox

This is a maintenance release, most importantly introducing some improvements to CSS property filters.

Additional changes

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CSS property matching improvements · 2016-11-14 13:05 by Felix Dahlke

About a year ago, we introduced CSS property filters as a means of hiding elements based on their styles. Today, we have landed two improvements to this:

Case insensitive matching

This is a change in semantics; CSS properties will now always be matched in a case insensitive manner, to make it consistent with the way Adblock Plus matches URLs. This is unlikely to result in undesired behaviour as there shouldn’t be many use cases for case sensitive property matching.

Regular expression matching

Until now, CSS properties could only be matched using the simple URL matching syntax, which made it difficult to match property values in a fine-grained manner. To address this, properties can now optionally be matched using regular expressions. The default matching behaviour is still the same, to use regular expressions, a matching expression needs to start and end with /, for example:

example.com##[-abp-properties='/width: 3[2-8]px;/']

These improvements are available in Adblock Plus for Firefox as of 2.8.1.4229 and Adblock Plus for Chrome and Opera as of 1.12.4.1682, and will presumably be released with the next stable version on each platform respectively.

Please note that we still consider CSS property filters an experimental feature, and therefore subject to change. Considering this, and the fact that CSS property filters are slower than regular element hiding rules, they should only be used as a last resort.

To the install page

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Adblock Plus 2.8.1 for Firefox released · 2016-10-28 14:37 by Wladimir Palant

Install Adblock Plus 2.8.1 for Firefox

Our Adblock Plus 2.8 release introduced a regression that went unnoticed for months in the development builds. Users who activated the please_kill_startup_performance preference were experiencing data loss: filters didn’t load completely. Also, importing custom filters was failing for large files. Both issues have the same root cause (issue 4576) and have been resolved in Adblock Plus 2.8.1. If your data is still incomplete after updating to Adblock Plus 2.8.1 please click the “Backup and Restore” button in Filter Preferences — one of the automatically created backups is certain to be correct.

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Adblock Plus 2.8 for Firefox released · 2016-10-25 12:38 by Wladimir Palant

Install Adblock Plus 2.8 for Firefox

This release changes the way element hiding works in Firefox, so that noticeable delays from changing a single element hiding rule should be no more. Also, the behavior should be more consistent now and filters not applying on a particular website should no longer be able to cause unexpected side-effects. On the downside, changes to element hiding rules will only apply after a page is reloaded now (which is actually consistent with blocking rules).

Additional changes

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New element hiding approach in Firefox · 2016-10-10 15:46 by Wladimir Palant

Traditionally, element hiding on Firefox worked quite differently from all other platforms supported by Adblock Plus. Rather than decide on the filters for each website individually, all element hiding rules would be written into a single elemhide.css stylesheet file that would apply to all websites unconditionally. This approach had a few disadvantages:

Luckily, Firefox implemented better mechanisms to apply stylesheets to documents a while ago and as of Adblock Plus 2.7.3.4206-beta development build we are now taking full advantage of these. We will now make a separate decision for each website, which (if any) element hiding rules should apply. And we don’t sacrifice performance for that because the majority of element hiding rules will go into a preloaded stylesheet with all the rules which apply unconditionally.

There are a few drawbacks here:

This is a huge change to the inner workings of Adblock Plus and while we tested it quite thoroughly some issues are expected — let us know if you notice any.

To the install page

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