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Thanks for the script. It works perfectly. I'm using it in Adguard For Windows.
Feature request: I was wondering if you would add code into it to make YouTube always use Theater mode by default? Because in browser's incognito/private mode I have to manually click on the Theater mode button.

I've added the feature!
Just change autoTheater's value in Line 14 into 1!
Please try it and tell me if it's working properly!

I've added the feature!
Just change autoTheater's value in Line 14 into 1!
Please try it and tell me if it's working properly!

Thank you very much for adding it. It works but there is one issue. Check the screenshot. Some things are inside the video player that shouldn't be. Tested on Violentmonkey. If it helps in any case, my monitor resolution is only 1366x768.

Have Fixed that in ver 1.1.2!
Please try it!