From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20010916 BuildID: 20010916 Expanding all of the trees in the preferences dialog box and then collapsing the "appearance" tree causes a consistent segfault with the error message: "Warning prev sibling is not in our list!!!" Before the segfault it looks like the appearance text disappears or is jumbled at the top, then it crashes. It may also crash if you expand only one tree below "appearance" without collapsing "appearance", but I did not do that much testing. I'll try after I file the initial report. Reproducible: Always Steps to Reproduce: 1. Go to Edit --> Preferences 2. Expand every tree (but do not collapse "appearance" tree). 3. Collapse "appearance" tree. 4. Boom. Actual Results: Segfault with the error above. Expected Results: Collapsed the tree with no segfault.
It looks like if the scrollbar is created before trying to collapse the "appearance" tree, this does not happen. So it only happens when expanding past the size of the box that the preferences tree items appear in... and if the scrollbar is created somehow before trying to collapse the tree, it doesn't segfault. Just before it crashes, along with the text looking squished, the beginnings of a scrollbar appear.
This seems just a dup of Bug 86723 Preference dialog crashes when changing category twisties
yep, dup. *** This bug has been marked as a duplicate of 86723 ***
mass verification of duplicate bugs: to find all bugspam pertaining to this, set your search string to "DuplicateBugsBelongInZahadum". if you think this particular bug is *not* a duplicate, please provide a compelling reason, as well as check a recent *trunk* build (on the appropriate platform[s]), before reopening.