If you are using a non-factory keyboard (e.g. Swype or AI-type), it's possible that Firefox could be having trouble in launching the keyboard and, therefore, browser may crash.

Another possible explanation would be corrupted data. Try to go to System Settings, Applications, Manage Applications, Firefox, Clear data. This way you will remove all Firefox profiles and data and start over again.

I'm using the default LG keyboard (LG Lucid) but I do notice it seems to have trouble with input in general. It switches between the normal single line cursor and an orange square cursor. Then typing gets very choppy, backspace actually adds text.

Checked keyboard settings, cleared Firefox data- still nothing. Uninstalled FF and reinstalled and it seemed to work. Then I synced my bookmarks and it went back to crashing from the address bar.

Tried FF beta version. Exact same problem. Titlebar works until I sync. So useless.

i also get these kind of crashes from time to time (on a cm 10.1 device with swype as a custom keyboard)...

bp-2dc9891b-881a-4e3f-bf69-a000f2130817
bp-632530e5-9214-4669-8d33-decac2130817
bp-2e8f0abf-b3a5-41f4-b8b5-7f4482130810

https://bugzilla.mozilla.org/show_bug.cgi?id=863980

Spent too much of my vacation trying to fix this so I could access my travel plans. No working bookmarks means no Firefox for me.