Thank you for the review!
I am downloading Opera GX right now to see what's the sourcery behind their RGX mode.

If possible with Web technologies, I will implement it into the extension for sure.

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EDIT:
Apparently they do something within their browser implementation - internally.
However, I've been able to whip something up quickly and achieve better results:
https://imgur.com/a/pQUI5aD

The link contains images to original video, opera rgx mode and ultrawideo's future sharpening mode.