Opened on 02/28/2015 at 08:15:10 PM

Closed on 03/01/2015 at 08:00:16 AM

Last modified on 05/22/2019 at 07:50:37 AM

#2065 closed defect (incomplete)

Element Hiding Rules No Longer Work in Firefox 36

Reported by: nonbongo Assignee: trev
Priority: Unknown Milestone:
Module: Adblock-Plus-for-Firefox Keywords:
Cc: arthur, mapx Blocked By:
Blocking: Platform: Firefox
Ready: no Confidential: no
Tester: Verified working:
Review URL(s):



Xubuntu Linux 14.04 trusty (kernel: x86_64 Linux 3.13.0-46-generic)
Firefox 36.0
ABP 2.6.7
Filters = EasyPrivacy+EasyList, Fanboy's Annoyance List, Adblock Warning Removal List

How to reproduce

  1. Go to any website.
  2. Hide any element manually, or with the Element Hiding Helper.
  3. Watch the element disappear briefly, then reappear again.

Observed behaviour

Element hiding rules no longer work. I suspect this has something to do with the release of Firefox 36. I have tried reinstalling both ABP and the Element Hiding helper. I have tried clearing cookies and cache. I have tried a fresh profile. Nothing works.

Expected behaviour

Element hiding rules should work.

Attachments (0)

Change History (10)

comment:1 Changed on 02/28/2015 at 08:23:45 PM by nonbongo

Others seem to be having this issue as well:

comment:2 Changed on 02/28/2015 at 09:03:00 PM by nonbongo

Some folks are saying that it appears to be a filter issue, because apparently restoring their oldest backup re-enables ABP's ability to hide elements.

comment:3 Changed on 02/28/2015 at 10:46:09 PM by mapx

  • Cc arthur added
  • Component changed from Unknown to Adblock-Plus-for-Firefox
  • Owner set to trev

-it seems to be some wrong filter in easylist
To reproduce the issue:
-go to
-create (EHH) some hiding filter ==> does not work
-if disable easylist and add EasyList without element hiding ==> will work

comment:4 Changed on 02/28/2015 at 10:46:36 PM by mapx

  • Cc mapx added

comment:5 Changed on 02/28/2015 at 11:03:37 PM by nonbongo

thank you for quickly getting on it! it is indeed an issue with easylist.

comment:6 Changed on 03/01/2015 at 12:43:39 AM by fanboy

Okay I'm starting to hit this.

Firefox stable (Adblock Plus stable):
Firefox Nightly (Adblock Plus Dev):

1) Add the Annoyances List
2) Visit
3) The popup at the bottom should be hidden, and "free signup" in article should be also gone.

Note: If you manually add these filters it hides them.

Bug seems to the with the ",", because this fails:,,

comment:7 Changed on 03/01/2015 at 02:26:13 AM by fanboy

Okay I've found the issue, should be fixed. Force an update.

comment:8 Changed on 03/01/2015 at 06:58:38 AM by mapx

Which was the error ?

And why chrome wasn't affected ? (could be #521 issue for FF ? )

comment:9 Changed on 03/01/2015 at 08:00:16 AM by trev

  • Resolution set to incomplete
  • Status changed from new to closed

Ok, so the issue was a missing quotation mark in the filter in EasyList. No Adblock Plus bug here (#521 is unrelated), this is just how element hiding works.

Chrome was likely affected as well, but element hiding works differently there so this filter didn't have any global impact. Note that in Chrome we are already validating element hiding filters when they are added, the same mechanism should be added in Firefox as well soon.

comment:10 Changed on 05/20/2015 at 02:22:39 PM by philll

  • Platform changed from Firefox/Firefox Mobile to Firefox

Made Firefox and Firefox mobile available as seperate platforms.

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