Mine too. Firefox, but only on my work machine. My home desktop is fine. I've had weird Firefox issues whenever there's video (like that banner at the top) and if I watch the output, it looks like GLX issues (my work laptop should just be either Intel integrated ... I wonder if the driver is crashing)
Check out about:crashes, you can submit a dump to the trace servers and get a backtrace that will tell you where it's crashing, and make it easy to file a bug report.
Can't reproduce on Windows 10 on Firefox 42, but Firefox 36 on Windows 7 crashed to the extent that it's saying it can't find my profile. It's a work machine and I blame AppV.