Nice extension.
[It would be great to be able to remove its entry to the right click context menu. Unfortunately, Firefox has no native way to do this, so the extensions have to provide this option.]

Edit: It's possible (see developer's response)

it's gtk and not native (because it's flatpak) but it's best yt-dlp gui on destktop marketing

Works well for me on windows 11. Requires the fully installed version, portable doesn't work, if anyone was wondering. My only 'problem' is that every file seems to open another Parabolic.exe, instead of checking if the program is already open, but I hope this gets adjusted in any future updates.