Add-on name is pretty misleading. The use is more about resizing by cropping than adjusting the aspect ratio.

great extension for my CRT while watching stuff because my CRT crops edges by 9% by default this is great but i would like an option to keep it toggled on and not have to every new video go to the extension and click the saved aspect ratio please add an option to just keep it on

Amazing, so simple, yet it works great. I have a 32:9 ultrawide monitor and this allows me to get rid of the black bars as much as possible. Tried lots of other apps that promise similar things but this is the only one I could find that works.