>>326455690
The only way I've found to do it is with this janky firefox extension https://addons.mozilla.org/en-US/firefox/addon/youtube-vr/ , which works on 360 videos but not on 180.

I actually looked into it today and apparently google removed the youtube VR player on steam because it was unmaintained internally, and all dev effort is going solely to the quest youtube player. So no official way exists for pcvr to view 360 youtube videos at the moment.