The app extension lets you pick start time to end time on a youtube video, it's what I needed.

Works like a charm, as advertised. Also, interface is very simple to use

It works, but, if you play a playlist, and then skip to a different song - the switch is still ON, but the video won't repeat, the next one will play. You need to turn it off and then on again to have it work. Nonetheless, five stars because: 1. it works; 2. it has a really nice, clean UI; 3. doesn't need excessive amount of weird permissions; 4. no delay between ending a song and playing it again, no page restart etc.; 5. if you turn it OFF on a video in playlist, the next one will play (in some other addons, it's not always a given) :)

works! it is also very simple! I like it a lot -- extremely useful...

This addon is helpful for my listening to music on youtube

The best loop from A to B is great.it's what I need.And is working well on Nightly.Thank you!!!

A perfect replacement for a bunch of abandoned scripts and addons. It's so hard to find one that will default to repeating the whole video, but can also reliably loop a section. It's very responsive, simple, and quick to loop, no noticeable delay.

It could really use input fields to type in the start and end times. The slider is fairly accurate but it's hard to hit an exact point, much more so in longer videos.