[girst]

Regarding Fedora's Firefox: The Fedora Firefox mainainers, Martin Stransky and Jan Horak, are also the main maintainers of the Linux/GTK parts of Firefox. The VAAPI patches you've mentioned are (afair) mostly-if-not-all Martin's work. So he's not applying some rando's "untested" patches.

[symlinkk]

But the patches weren’t in Firefox’s codebase, so they didn’t go through the typical Firefox QA process including the Nightly, Beta, etc process.

I’m not saying those guys don’t know what they’re doing, obviously they are experts. But I would prefer to trust but verify (not just trust).