As title suggested.
Has happened to me at least 5-6 times, every time it happens I am logged on to kbin.social and have some other tabs opened at the same time… So I am strongly suspicious that kbin has something to do with it, but I could be wrong.
I’ve almost never seen Firefox crashing on my OS before. Not sure if it is a bug of some sort.
Nope.
With oddities like this I’d suggest a fresh Firefox profile. I’ve had massively slow rendering on some websites after moving mine when distro hopping and a fresh profile solved it.