Has been a really great addon for a long time until it stopped working for me three years ago.
So I did let it live in my firefox out of hope that someday there may be an update which would get it working again.

But I think after three years of waiting in vain, it's safe to pronounce this add-on dead, uninstall it and look for alternatives.

So long, and thanks for all the videos, but I guess it's time to move on.