I ran 
gdb firefox-bin pid 
on firefox while it was in its "crashed" state right after clicking a link that 
would use javascript to open a second pop-up window. I ran gdb a few times and 
received the following at the bottom of the different reports:

0xb7f2826b in JS_GetClass () from /usr/lib/firefox/libmozjs.so

0xb7f3ae1f in JS_GetFrameFunctionObject () from
/usr/lib/firefox/libmozjs.so

0xb7f4d7a8 in ?? () from /usr/lib/firefox/libmozjs.so

0xb7f4d7ab in ?? () from /usr/lib/firefox/libmozjs.so

I also noticed that while firefox is hanging the process proceeds to use
100% cpu until you kill it.

Looks like an issue with javascript.

-- 
firefox crash
https://bugs.launchpad.net/bugs/156134
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