I'd call it junkware: junk not worth having on your computer.
I would rate this ZERO/ZILCH stars if I could. I am quitting Firefox because of these new versions that don't allow all the great old extensions. They should have worked with the good ones instead of offering this lousy one. I mean, DOS is more user friendly than this thing.
Simply does not work well so it's time to switch back to Chrome or if they don't have something better, I'll find one that does.