This bug was filed from the Socorro interface and is
report bp-754bc3cc-0c40-4060-b2ee-eea172110425 .
Seen while reviewing trunk crash stats. https://crash-stats.mozilla.com/report/index/754bc3cc-0c40-4060-b2ee-eea172110425 is one report.
Frame Module Signature [Expand] Source
0 xul.dll IsBreakElement extensions/spellcheck/src/mozInlineSpellWordUtil.cpp:507
1 xul.dll mozInlineSpellWordUtil::BuildSoftText extensions/spellcheck/src/mozInlineSpellWordUtil.cpp:569
http://tinyurl.com/4xu9xcj links to the most recent crashes. This crash happens on Windows, Mac and Linux.
*** Bug 652481 has been marked as a duplicate of this bug. ***
I managed to reproduce this when playing with Yandex search...
1. Search for something on Yandex.
2. on the results page, right click the search field, and check the Check Spelling menu item.
3. Edit the search query to make it incorrect as far as spelling is concerned.
4. Press back. -> Crash.
Fixed by backout of bug 616684.
*** Bug 652763 has been marked as a duplicate of this bug. ***