It's been a long time since I have seen a firefox crash on Linux.
What's killing me is the memory leak that just renders the whole computer unusable and almost frozen. Almost because if I can grab a terminal and killall firefox then I get the machine back.
https://bugzilla.redhat.com/show_bug.cgi?id=1597028 something like that, not sure about the root cause. But I don't let imgur tab with running vid opened for too long now.
I've found that earlyoom [1] can at least save me from having a complete freeze. There are packages for most distros.