If you have time, please file a bug with some links from your about:crashes. At least for Firefox, 600 tabs really isn't that many. (At least for us many-tab pe

If you have time, please file a bug with some links from your about:crashes. At least for Firefox, 600 tabs really isn't that many. (At least for us many-tab people; the more common "...but why would you ever have more than half a dozen tabs open, ever?!!" people will look at me in horror.) I don't know for sure, but those error messages look more like what happens when one process (eg the renderer) crashes and severs its connections with others. They're probably unrelated to the actual problem. It may be that what you're running into is a side effect of forcing WebRender on blacklisted hardware? I could imagine it starting to use a new API that's buggy in your driver. </wild-handwaving>.