Here's a recent crash report: https://crash-stats.mozilla.com/report/index/6486fc5b-ab45-491f-8b02-5dcc12110609 I haven't been able to identify a specific cause but Firefox crashes a couple times per day for me -- often it gets a lot slower before it crashes entirely. Another problem I get is occasional graphical corruption. Finally, a lot of times if I leave my computer and come back 10 hours later, Firefox will have crashed. This happens pretty frequently.