My Firefox chashes, i can´t kill it with task manager of windows, and can't shutdown my computer, i must reset my computer.

This situation was when i was reading my Gmail.

I just had the same problem (this is actually the 3rd or 4th time in fact). I'm running Windows 7 and Firefox 8. While I don't have a fix for the problem (i.e. the cause), I do have a solution that seemed to work for me.
# Open taskmgr.
# End process tree for "firefox.exe" (I know, it doesn't work but do this step anyway.)
# End process tree for "explorer.exe" (this will make your screen blank except for your wallpaper since you just killed windows explorer.)
# ctrl+alt+delete and re-open taskmgr.
# Click "File" -> "New Task (Run...)"
# In the field to the right of "Open:", type "explorer"
# Click "OK" (or, press enter)
This will restart windows explorer and when I re-opened taskmgr, Firefox was no longer listed and I was able to restart Firefox.
Hope this helps. Merry Christmas.
~palaceguard247

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