"Firefox has performance problems though"
I'm sure it does, as all browsers do, but doesn't it seem a bit weird to you that it's always *Youtube* that people are complaining about, a site which barely has any complexity in it besides showing you a video?
@joepie91 Yes. And the problems started specifically when Youtube turned their anti-adblock-campaign to 11. Should be obvious enough,
Also Youtube has no reason to be slow. The video is handled by hardware acceleration, and everything else should be trivial enough to not even notice.