Literally doesn't work anymore and seems to be just abandoned or put on the back burner behind a pile of other stuff.

This Add-on does not work and therefore it is useless!

Useless (no effect) scum: installed, no effects, doesn't affect, as never installed.

Doesn't do anything.

It doesn't redirect anything on Windows. I wanted to use FreeTube but it looks like this project is abandonware. Last update 2018 btw.

Does not work

On Linux Mint with Firefox 86.0, no reaction: YouTube links in Facebook always and only open with YouTube. The FreeTube extension has no use.

Doesnt work, just opens the app.

As people have been saying for a while, links open in the FreeTube app but don't load at all. Thanks to the author for creating the extension, but until this bug is fixed the extension is effectively broken.