Start Firefox in [https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Safe Mode to Troubleshoot the issue] and to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance). * https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Process Type plugin Shockwave Flash If you have problems with current Shockwave Flash plugin versions then check this: * see if there are updates for your graphics drive drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration * disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later) https://forums.adobe.com/message/4468493#TemporaryWorkaround * disable hardware acceleration in the Flash plugin https://forums.adobe.com/thread/891337 See also: * http://kb.mozillazine.org/Flash#Troubleshooting