Is this an "in plug-in" crash where you see a crash error inside a gray box in the page? I know you said you have tried all fixes, but if you wouldn't mind ticking off the following just in case: (1) If you have any recorders/downloaders that interact with Flash media make sure they are as up-to-date as possible, or disable them temporarily. (2) Disable hardware acceleration in the Flash plugin. See this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues (3) Disable the Flash plugin's protected mode feature. This involves creating or editing a settings file. The following pages/posts provide different ways to do that: * Adobe support article under the heading "Last Resort": [http://forums.adobe.com/message/4468493#TemporaryWorkaround Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?] * Manual steps: https://support.mozilla.org/questions/968190?page=5#answer-509209 * Batch file to automate the manual steps: https://support.mozilla.org/questions/982093#answer-518078 Flash needs to completely unload from memory (restarting Firefox might help) before this would take effect. Any improvement?