You expose your system to security vulnerabilities by running such an old version of Firefox. * https://www.mozilla.org/security/known-vulnerabilities/firefox.html * [[How to make the new Firefox look like the old Firefox]] ---- The issue could be caused by one of your add-ons. Restart Firefox with Add-ons Disabled to check if that's the case. * [[Troubleshoot Firefox issues using Safe Mode]] If the problem goes away in Safe Mode, you can either try to determine which add-on is to blame, or you can Reset Firefox and get rid of them all. * [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] * [[Reset Firefox – easily fix most problems]] If the problem persists in Safe Mode, please attach a screenshot of it. * [[How do I create a screenshot of my problem?]]