I'm a longtime user of the Chrome version and just moved to Firefox. YouTube's stock layouts for streams with chat are terrible enough to make this extension one of the essentials. I've never had problems with it, and the dev is quick with any necessary fixes (due to YouTube changing things).

In case it might save someone some trouble with initial setup, make sure you right-click the extension and enable Always Allow on www.youtube.com. I spent a good few minutes trying to figure out why it wasn't working before seeing that step mentioned elsewhere.

makes youtube livestreaming so much more enjoyable!

No longer working.

It just won't work.

Works great. Also the developer fixes problems quickly(because of YouTube changes)

The best YouTube livestream chat extension there is. Very simple to use and has fantastic options to customize with.

Developer also updates as soon as YouTube does some tomfoolery which is greatly appreciated.

However a suggestion I may add is having the live chat be able to shift to the bottom of the video player when the browser window is cascaded to the side when there's two windows, similar to how FrankerFaceZ allows that option, because I tend to watch and do stuff on the side and also the YouTube stream does hard crash the browser tab when I cascade, requiring me to sometimes disable the extension in the video player.

The features introduced by this extension are so simple and obvious that I can't stomach using YouTube's default half-baked theater mode anymore.

The dev is also very quick to push updates when the Google engineers get bored and decide to start tinkering with YouTube's backend.

Highly recommend!

Good addon but theater mode randomly stops working every few weeks and have to remove and re-add it.

Video no longer showing in theater mode as of 22 august update.

Works like a charm, easy to access, easy to modify almost every aspect of it, and regularly updated if youtube breaks something.
I hope I'm rich enough to donate, but leaving 5 star rating and some comments is best I can do.

The "Prevent the video from pausing when clicking on it while in livestreams theater mode" option doesn't seem to work anymore.

best chat extension for youtube. Hope there were shortcut to toggle chat modes for over video vs beside video

I have tried a lot of extensions and scripts like this, but this one is definitely the best one I tried so far. The only problem I have with this is that even non-live videos keep switching to theater mode for some reason which is annoying.Hopefully that gets fixed if possible.

Stopped working for me on june 29 :((
EDIT: fixed, ty!

There should be a setting to disable the overlay on the video because I end up moving mouse and clicking on the links on overlay as I am watching video. Very disruptive. Love the theater mode though.

could you fix the compatibility with "Reddit comments for Youtube"?

The only thing that keeps me from using this extension

Works awesome, but the enhance youtube addon interferce and breaks it. So its needed to be disabled

genius.. just like twitch.
Also works well with the github "YouTubePatchCollection" (revert to previous youtube display)

It is sometimes incompatible with "Enhancer for YouTube".