Correction - 3 to 4 stars: The current version can be used without cookies to activation! Thanks a lot :)
Small suggestion for improvement: Immediate feedback would be good if the Pro version was activated. Furthermore, of course, the privacy concerns remain.

##Old feedback##
Using the Pro version is too cumbersome. Why is there a cookie instead of a license file? The associated release of cookies is a prerequisite for the Firefox security functions.
In terms of data protection, I also have the question of what data is collected when you make a request for an HD video.

In any case, the result is perfect. Rework on the addon is definitely possible.