I'm seeing a similar problem here. Kubuntu gutsy.
firefox hangs with this system call:
futex(0xa75fdbd8, FUTEX_WAIT, 20644, NULL)
The screen freezes, no redrawing.
It happens to me most often while on youtube.com
When clicking on random video 'play' buttons (there's embedded macromedia flash
there) it hangs and never comes back.
The only way out is a 'killall -9 firefox-bin' (SIGKILL) and restarting
firefox.
Next time it happens, I'll try to get a stack trace.
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[gutsy] firefox freezes with google toolbar enabled when you attemp to open
more than two windows
https://bugs.launchpad.net/bugs/135110
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