Unfortunately not working as of a few weeks ago (2024-05-07), selecting vertical mode overlays the chat on top of the video, making it unwatchable.

Works great! (as of 7/24)

Feature request if possible: Have it use the player variant that theater mode uses so you can mouse over and see stream title/viewer count. Thanks

When it works, it's great, I have a veritcle second monitor that I read stuff on, and that's good to lurk streams on. Right now there's an issue where chat is alligning to the top of the window rather than the bottom, which covers the stream.

I'm so glad I found this add-on. The only complaint I have is that when I enter this view the side bar with my followed streamers is still on screen. Since I am already using a vertical screen, I want to maximize the real estate for the stream viewer. If this could be an option in the settings, that would be awesome!

It does what it says. However when sidebar is minimized, empty spot appears on the left side of chat.
Edit: After update i checked back in 23.5.2022. On vertical 1080p monitor there is still empty space on the left between hidden Twitch channels and actual chat window.