The h264ify add-on will let your computer load YouTube videos more efficiently on Firefox, if it supports hardware acceleration for H.264 but not VP8/VP9.
No thanks.
But you’re still missing the point, this should be compiled into Firefox core, if it’s a licensing thing badge it as Firefox-non free. Not everybody cares about altruistic goals, I just want a browser that works so I can do my job, securely.
Edit: but if you don’t already see a future where ultimately open source cannot be trusted unless it comes from a trusted repo (yum, apt) then you should start preparing for that.