Try updating your plugins.

''d_roe1234 [[#answer-796246|said]]'' <blockquote> Try updating your plugins. </blockquote> A good idea, but you should include links or instructions. '''[https://www.mozilla.org/en-US/plugincheck/ Use this link to check that your plugins are up-to-date.]''' If any are listed as unknown or research, do not worry about them. ------------------- 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'''