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I cannot use the scroll, cannot change tabs, autocomplete for the URLs does not work

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cannot use scroll, cannot change tabs, cannot use autocomplete in the URL tab. this was working

This happened

A few times a week

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Do you have that problem when running in the Firefox SafeMode? http://support.mozilla.com/en-US/kb/Safe+Mode Don't select anything right now, just use "Continue in SafeMode."

If not, see this: http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...