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After running Firefox for awhile the drop down menus fail. Suggestions?

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After running Firefox 3.6.8 for awhile the drop down menus begin to fail. A menu outline is still visible but no details show & access to content becomes unavailable at that time. Suggestions?

After running Firefox 3.6.8 for awhile the drop down menus begin to fail. A menu outline is still visible but no details show & access to content becomes unavailable at that time. Suggestions?

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There's an extension, whose name I don't recall right now, that has been known to cause that problem. You need to troubleshoot your extensions to discover which one is causing that to happen.

http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...