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When using Firefox 3.6.6 with Windows 7 operating system, Windows will close Firefox. How do I fix this?

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I am using Firefox 3.6.6 on a Windows 7 PC. About once a day. I get a Windows error message saying that it had to close Firefox. How do I fix this? I have toolbar for Firefox, Google toolbar for Firefox, Java Console 6, Java Quick Starter 1, OneClick YouTube downloader. StumbleUpon 3.64, and Trend Micro Toolbar 1.6.0.1126

I am using Firefox 3.6.6 on a Windows 7 PC. About once a day. I get a Windows error message saying that it had to close Firefox. How do I fix this? I have toolbar for Firefox, Google toolbar for Firefox, Java Console 6, Java Quick Starter 1, OneClick YouTube downloader. StumbleUpon 3.64, and Trend Micro Toolbar 1.6.0.1126

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Start Firefox in Use Troubleshoot Mode in Firefox and go to Tools->Addons->Extensions and try disabling Trend Micro Toolbar.

Sometimes AV softwares install certain toolbars that mess with Firefox configuration settings