FF has started crashing in the last few weeks. I haven't found a repeatable scenario until now. There is a specific video on Youtube that crashes 100% of the time (IE and Chrome are fine). I went through all the recommendations: 1. Remove FF (and the ProgramFiles\Mozilla Firefox folder), then reinstalled 2. Removed and reinstalled Flash 3. Turned off hardware acceleration in Flash 4. Turned off Flash protected mode 5. Turn on HTML5 player for Youtube Here are latest crash reports, all pointing to the same video file. There is probably something more basic causing the crashes. This video is the most repeatable. Report ID Date Submitted bp-f65af5f3-b861-4bd8-81c5-3eb9c2151009 10/9/2015 8:52 AM bp-9f1873e1-2a2e-4934-9f37-231b22151009 10/9/2015 8:46 AM bp-22ac83be-017d-4356-b828-88d0d2151009 10/9/2015 8:42 AM bp-409a8a59-13eb-4679-b589-122c12151009 10/9/2015 8:14 AM bp-af013b97-6cde-48bd-ae4f-55f532151009 10/9/2015 6:45 AM bp-6a93da81-1670-44b7-8ce9-7775e2151009 10/9/2015 6:40 AM I tried using Help->Troubleshooting Information in FF --> it crashed. I'm writing this in Chrome since my first submission was lost with a crash. I'm manually filling in the troubleshooting questions after starting Firefox in safe mode.