I'm a Linux oldie, but a Mint newbie. When I try to play a video at a website, Firefox exits.
I renamed the .mozilla folder to give Firefox a fresh start, but the problem is still there.
I noted that a search did not turn up anyone else with this problem, but I know what forum searches are like.
P.S. I was able to play a YouTube video in Google Reader, but a video on a sales site caused the crash.