I like to put streams i watch on my vertical monitor, and this extension works flawlessly on Chrome.
Using this extension on Firefox causes the vertical mode to exit to default by itself if i click out of the window and clicking back into it. It's quite annoying because i nee to enter vertical mode each time i want to write to the streamer.
I'll give this extension 5 stars if this bug can be fixed.

Thanks for this extension, works great on my portrait monitor.

I also had problems with this extension stopping working and even after updating to 1.5 version it did not work. However, I was able to resolve the problem by switching my Twitch language to English. It seems the extension relies on Aria-labels that change based on the Twitch language setting, and it specifically references English values.

Stopped working for me today also, and doesn't work even after 1.5 update :( I love this plugin, and I can't be without it.

Simple, easy to use.
Would be cool to hide channel list, to have a vertical studio mode.

Honestly, i love the simple approach of this one, although there is ONE thing that would make it even better: make it hide the top banner and the suggested twitch channels on the left bar, and then it would be perfect. Basically, what "theater mode" does, but vertical.

Great extension, does exactly what I wanted. It would be even better if it worked in theatre mode and allowed you to swap the top/bottom places between stream and chat.

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!

Thanks!!!

I use portrait aligned monitor and this addon make twitch absolutely fit to it.

exactly what I was looking for.

Only a minor bug with the chat not fully stretching the width of the window, but still better than before.

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.

This is perfectly minimal and does exactly what you want it to. It's as simple as an icon on the Twitch UI. Honestly I wish more add-ons were designed like this one.

Does exactly what it says in a simple and straightforward way.
Perfect!

If you have a monitor on portrait mode and for some reason you want to watch twitch with chat, this addon is exactly what you want. Very simple and straightforward.