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Firefox crashes when left unused overnight

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I have Firefox 4.01. When Firefox is left open on my PC overnight when I go to use my PC in the morning I see that it has crashed. I uninstalled Flash with the uninstaller program then reinstalled it so I don't think it's that which is causing the problem. I submitted the crash report when Firefox asked me to.

I don't want to upgrade to a newer version of Firefox because my Multirow Bookmarks Toolbar extension doesn't work with newer versions of Firefox yet.

I have Firefox 4.01. When Firefox is left open on my PC overnight when I go to use my PC in the morning I see that it has crashed. I uninstalled Flash with the uninstaller program then reinstalled it so I don't think it's that which is causing the problem. I submitted the crash report when Firefox asked me to. I don't want to upgrade to a newer version of Firefox because my Multirow Bookmarks Toolbar extension doesn't work with newer versions of Firefox yet.

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If you want your addon, you should download firefox 3.6.24 instead of 4,