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Since updated to Firefox5, I am problems with some websites working slowly, not loading, or not loading unless I move the mouse

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Refreshing, moving around sites, etc. go slowly, sometimes I need to move the mouse around the pages to load. I never had this problem before updating to 5. Can I go back to 4?

Refreshing, moving around sites, etc. go slowly, sometimes I need to move the mouse around the pages to load. I never had this problem before updating to 5. Can I go back to 4?

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).