Wonderful addon for those of us with a secondary or primary CRT monitor, since a lot of people forget to encode youtube uploads in 4:3 even if they contain no data outside that resolution.

My only request would be to allow it on a per-tab basis or restrict it to certain aspect ratios, since my primary monitor is ultrawide and I'd have to disable it manually every time I wanted to switch monitors. It looks like that's a work in progress for the pro version, but I'm not sure. Excellent addon nonetheless. It works instantly and flawlessly.