You can check for problems with current Shockwave Flash plugin versions and try this: *make sure you have the latest Flash version:<br>http://www.adobe.com/special/products/flashplayer/fp_distribution3.html *check for updates for your graphics drive drivers<br>https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration *disable protected mode in the Flash plugin (Windows Vista and later)<br>https://support.mozilla.org/kb/adobe-flash-protected-mode-firefox *disable hardware acceleration in the Flash plugin<br>https://helpx.adobe.com/flash-player/kb/video-playback-issues.html *disable hardware acceleration in Firefox<br />https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration See also: *http://kb.mozillazine.org/Flash#Troubleshooting