Greasy Fork is available in English.
(Be Tested Daily) Bypass all youtube ads (skippable and non-skippable Ads) plus download youtube video on the fly
< Feedback em Youtube Ad Cleaner(Include Non-Skippable Ads- works)
The script only skips Ads, nothing to do with the video resolution. You probably need to check your youtube settings.
Appears to limit playback to 720P.