Been using for many years and it works good but I need to know how to remove last part of URL for one site. But don't see any way to contact developer.

Very easy to use! I am using it to watch YouTube shorts in the regular player!

It's as easy as entering:
www.youtube.com/shorts/* as the origin and:
www.youtube.com/video/* as the destination!

This is a very useful tool, I highly recommend it!
My only complaint is that it only seems to work when opening a YouTube link in a new tab (ctrl+left mouse button).

Works as intended. I'm now trying to figure a way to dynamically update this... or if you could provide a way to bulk update those settings, it'd be great.