Are you having a problem with all sites or a few? What player do those sites use? flash, HTML5 . . . . . -------------------- Youtube currently uses the HTML5 player. https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues ------------------------- If you have problems with current Shockwave Flash plugin versions then check this: * see if there are updates for your graphics 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'''