This extension worked amazingly well, however something happened and suddenly livestream quality options were limited to up to 480p and vod quality was limited to up to 720p. Disabling this extension revealed the quality options again and enabling again hid the options again. The issue stopped at my first troubleshooting step, being removing and re-adding the extension and now the extension works completely fine again. Just something to keep in mind for anyone else who might have this issue, and maybe something to look into on the developer's side. Great extension for yet another feature that *should* be default on YouTube!

Works fantastic. I'm don't know any technicalities here, but all the resolutions from 144p to 8K selectable as the default at 60fps, and the option for 30fps (although only up to 720p) are baffling for being absent on regular youtube. I don't use official youtube playback often, but when required this addon makes the experience so much more tolerable.