Describe the bug

YouTube tabs reliably crash within a few minutes on nixpkgs-built firefox

Steps To Reproduce

Steps to reproduce the behavior:

1. Open firefox from latest nixos-unstable (931ab058daa)
2. Go to some youtube user's video list
3. Scroll up and down for a bit

Additional context

This doesn't happen with my previous env (using firefox 92.0.1, I think 31ffc50c571 but I haven't confirmed), nor with firefox-bin. It does happen with firefox-esr.

Also, the about:crashes page is not available on the nixpkgs-built firefox.

Notify maintainers

@edolstra @lovesegfault @mweinelt