Recent crashes of certain multimedia contents (this includes Youtube videos, certain flash games and other applications) in conjunction with Firefox are most probably caused by a recent Flash update and/or a malfunctioning browser plugin such as Real Player. In order to remedy the problem, please perform the steps mentioned in these Knowledge Base articles: * [[Flash Plugin - Keep it up to date and troubleshoot problems]] * [[Flash 11.3 crashes]] * [[Flash 11.3 doesn't load video in Firefox]] Other, more technical information about these issues can be found under these Links: * http://forums.adobe.com/thread/1018071?tstart=0 * http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html You can check for problems with current Flash plugin versions and try these: * disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed * disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later) * disable hardware acceleration in the Flash plugin http://kb.mozillazine.org/Flash#Troubleshooting Please tell us if this helped!