Thank you for the crash IDs. When I look at the bugs it links to, I regret to say there isn't an obvious solution on the way. One comment was: "Flash is just super duper slow under some cases, and we kill it." Another said that #3 below was a workaround for at least one user's problem. This is some standard guidance that addresses the most common issues with the Flash Player plugin. I'm sure you've seen some of it before, but 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 graphics acceleration in Firefox and in Flash * In Firefox, un-check the box here and restart:<Br><Br>orange Firefox button (or Tools menu) > Options > Advanced > General > "Use hardware acceleration when available" * In Flash, 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 protected mode feature. The following pages provide different ways to disable the feature: * 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 Any improvement?