Full screen mode on Ultrawide monitor stretches the video

Whenever I try to watch media in 16:9 ratio on my 21:9 ratio monitor and put the video in full screen, which to me is necessary to focus on the content. The entire video just stretches. I get this when I try to watch media from my own files or TurtleTube. I do not get this issue with Netflix.

This issue makes watching content unbearable.

Video: roq01rXS05

Hi, should be fixed now.

I still have the issue, even after updating the extension.

On the website video file player (Language Reactor), or the extension?

I have it wherever, extension or the browser. I also tried to run the website via Firefox and in Firefox I didn’t have the issue with Turtletube, but with local files the issue still remained.