The intrusive "Ad blocker are not allowed on YouTube" message is annoying. This open-source project aims to address this issue by providing a solution to bypass YouTube's ad blocker detection
the newer versions use the youtube embedded video player, you can downgrade to 5.3 (click the Raw button on upper right) and that version is mostly functional. it sometimes gets detected on prerolls, but you can refresh past it till it's fixed, at least
Theater mode no longer work, or att least the button is no longer present in the media-bar