A well written plugin that implements an A-B looper popup by a button under the youtube video. The best part of it is that it's open source, on github, and it actually works in the latest Firefox (Librewolf) unlike many others. MIT license and open source means we can fix it as well if we ever need to.

Excellent tool for musicians out there to auto loop segments of a video for study, with a repeat count as well if you want. I think this is a really good take on an A-B looper, solving the function without getting in the way, by adding looper button next to subscribe (under the video) which in turn opens a menu that spawns above the description when clicked, and can be hidden again while in use.

To use you can mark via mouse using the menu buttons and click set start / set end, or just enter the --:-- / --:-- duration for start and end manually via keyboard (with 1 second granularity.)

Nice work developer, I'd say this is a must have plugin.

I'd also say it's underrated, but it seems it just released ..so I've adjusted your rating to 100% (1 of 1) five star reviews ;-)