I use the Firefox start page as my home page because I don't like my browser taking time to load stuff that I won't use every time I start it (in the common case that I'm intending to immediately open a bookmark, etc). Recently, the front page has been hard-stalling: Firefox becomes completely unresponsive for over a second. I got tired of it today and disabled all of my addons and extensions, then turned them on one at a time until the stall returned. I was surprised to see that ABP was the culprit. I made a new profile and installed ABP and - sure enough - the stall was present. I'm not sure what changed, but I'm going to try to roll back ABP for now. I just wanted to bring this to your attention.
ABP version is 2.5.1. Firefox version is 28.0.
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Update - Rolling back didn't help. Maybe this is an issue caused by some change in Firefox 28.0? Will continue testing. Is anyone else experiencing this?
To be more clear, the Firefox page "about:home" is the one stalling. It seems to have something to do with the little blurb beneath the search box, since that always loads immediately after the stall clears up.
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Rolling back Firefox doesn't seem to fix it either. This is bizzare. I guess the only remaining explanation is that the little block under the search bar that gets loaded has somehow changed in a way that's causing ABP to stall.
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Confirmed. I saved the page to my desktop and opened it from there and the stall was present. I edited the file and removed the 'snippet' div and now the stall is gone. Oh well, I never liked that thing anyway.
Firefox Start Page stalls for over a second (ABP 2.5.1)
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adb_fan
Re: Firefox Start Page stalls for over a second (ABP 2.5.1)
I came on the forum to post the same bug and I saw this thread already here.
I have exactly the same issue, adblock plus 2.5.1 hogs firefox 28.0 for about 10 seconds when pressing home button in browser, where home is "Mozilla Firefox Start Page" (with no address). I suspect adblock can't see any address and then parse the entire filter while freezing firefox or something like that. I tested even with a completely new firefox profile with no other addons installed with same result. I hope this was helpful, please fix it!!
I have exactly the same issue, adblock plus 2.5.1 hogs firefox 28.0 for about 10 seconds when pressing home button in browser, where home is "Mozilla Firefox Start Page" (with no address). I suspect adblock can't see any address and then parse the entire filter while freezing firefox or something like that. I tested even with a completely new firefox profile with no other addons installed with same result. I hope this was helpful, please fix it!!
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adb_fan
Re: Firefox Start Page stalls for over a second (ABP 2.5.1)
Nope, I installed it (it says version 2.6.0.3803) but no change. In face there was same lag just immediately after install.
(a few minutes later)
I have deleted all default subscriptions and the lag is gone. But when I reinstall easylist lags come back instantly. I also tried to enable/disable "Allow some non-intrusive ads", but same result. I really think that it parses the whole filter list for some reason. By the way, same lag appears when pressing "Filter preferences" on the adblock in the "Add-ons Manager" page or when switching from "Custom filters" tab to the "Filter subscriptions" tab.
(a few minutes later)
I have deleted all default subscriptions and the lag is gone. But when I reinstall easylist lags come back instantly. I also tried to enable/disable "Allow some non-intrusive ads", but same result. I really think that it parses the whole filter list for some reason. By the way, same lag appears when pressing "Filter preferences" on the adblock in the "Add-ons Manager" page or when switching from "Custom filters" tab to the "Filter subscriptions" tab.
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alucardo
Re: Firefox Start Page stalls for over a second (ABP 2.5.1)
I have the exact same issue (FF 28, ABP 2.5.1) and i suspect the tag src="data:image/svg+xml;base64,... with a whole png icon in base64 (apporox 7000 bytes) to be the cause of the problem.
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Khatharr
Re: Firefox Start Page stalls for over a second (ABP 2.5.1)
This is the slightly modified version of the start page that I'm using in the interim, for anyone who wants it:
http://www.datafilehost.com/d/f792010e
(You should always look at the code on things like this to ensure that there's nothing malicious. In this case, I removed the snippet div and changed the search form to include and 'action' tag. If you aren't using Google to search with you may need to fiddle with that a bit to get it to use your preferred search engine. It's not overly complex: it's a combination of the 'action' tag in 'searchForm' form and the 'name="q"' in the 'text' input.)
http://www.datafilehost.com/d/f792010e
(You should always look at the code on things like this to ensure that there's nothing malicious. In this case, I removed the snippet div and changed the search form to include and 'action' tag. If you aren't using Google to search with you may need to fiddle with that a bit to get it to use your preferred search engine. It's not overly complex: it's a combination of the 'action' tag in 'searchForm' form and the 'name="q"' in the 'text' input.)
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adb_fan
Re: Firefox Start Page stalls for over a second (ABP 2.5.1)
lag seems to be completely gone, I don't understand how it got fixed... maybe after updating easylist? did you guys fixed easylist or was it something local? 
Re: Firefox Start Page stalls for over a second (ABP 2.5.1)
Not all start pages require a lot of loading time. I use http://www.start.me and it's pretty fast in my opinion.