RE: Firefox stopped working
well it's not that easy... you can first test to start it in safe mode, you put this string in the target of the shortcut for firefox.
..\Mozilla Firefox\firefox.exe" -safe-mode
This makes all extensions deactivated, (you more a less reset firefox)
You may check if the process is running when you start, delete first then start.
If this not work you go to your windows profile ex C:/Users/You/ here you go to appdata or applicationdata then to roaming if you use vista. search after the mozilla folder.
you can try to un install firefox and delete all application data
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