"No tracking" wouldn't cause that. '''Try the Firefox SafeMode''' to see how it works there. <br /> ''A troubleshooting mode, which disables most Add-ons.'' <br /> [https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode#w_safe-mode-window_2 Troubleshoot Firefox issues using Firefox SafeMode] * You can open the Firefox 15.0+ SafeMode by holding the '''Shft''' key when you use the Firefox desktop or Start menu shortcut. * Or use the Help menu item, click on '''Restart with Add-ons Disabled...''' while Firefox is running. ''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shft key) to open it again.'' '''''If it is good in the Firefox SafeMode''''', your problem is probably caused by an extension, and you need to figure out which one. <br /> http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes <br /> Or it might be caused by Hardware Acceleration. ''When you figure out what is causing that, please let us know. It might help other user's who have that problem.''