For superultrawide this is a must have.

Unfortunately not reliable. Often times it requires a refresh of the page for it to even work. The hotkey works 50/50 and it honestly fails more than it works on both chrome and firefox

This is so good! YouTube should take this feature officially!

Nice extension if you use a Ultra-Widescreen!

Developer was super quick to fix an issue!!

The issues that was:
Recently (about 2-3 days ago) I noticed that when using Windowed FullScreen, the video cut-off (expands to fill the area) instead of having black bars.

its broke after youtube update :(
thx for the fix

Fantastic feature, but you need to refresh every single page once to get the button to appear.

Very good extension. Especially Useful for listening to lectures.

Works great for me! Shortcut button is nice to have. And the only permission required is to access youtube.com data. Thanks for the great add-on Navi

Auto-toggle nice

Cool add-on. I noticed it doesn't work on live videos (doesn't show the new button and the shortcut key doesn't work). Is this a known limitation or could it be something related with my specific configuration? Also, if I use the old youtube interface, the top bar (with the YT logo, search bar, etc.) overlaps the full-screen videos, but I doubt that this will affect many users as it's getting harder to disable the material design UI/polymer framework. Thanks for the add-on!

"Auto-toggle" is not enabled for other video pages after switching to "normal" mode.
P.S. By the left mouse button - yes. Opening a link to a video with the middle button does not save the settings, and I open it often.