Firefox crashes and won't start after upgrade to 9.01
Firefox will not start at all after upgrade to 9.01.
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Try following the instructions here: Firefox will not start
That can be a problem with the Norton toolbar (coFFPlgn.dll).
See Firefox 9 Support for Norton Toolbar:
I am using McAfee Total Protection instead of Norton But the same issue. I can not start Firefox past version 9.
First of all you could try installing the latest version and see if that would fix the problem
Does Firefox crash (you get a Firefox has crash window) or does Firefox simply doesn't start?
See:
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See: