That is a problem (hang) with the Shockwave Flash plugin. You can check for problems with current Shockwave Flash plugin versions and hardware acceleration in Firefox and try this: *make sure you have the latest Flash version:<br>*https://get.adobe.com/flashplayer/otherversions/ *check for updates for your graphics drive drivers<br>https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration *disable protected mode in the Flash plugin (Windows Vista and later)<br>https://support.mozilla.org/en-US/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/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration See also: *https://support.mozilla.org/en-US/kb/keep-flash-up-to-date-and-troubleshoot-problems *http://kb.mozillazine.org/Flash#Troubleshooting