I have been looking for an addon like this for so long! Only things I would change is it would be nice to have a toggle to switch to dark mode only while in theater mode. Would also be nice if it was open source. Other than that, perfect!
Thank you for your feedback. The newest version includes an option 'Force dark theme in theater mode', no need to change the theme yourself anymore. I will provide a link to the source code in the (somewhat) near future.
