I've heard/read good things about this add-on, but sadly it has one major fault - when ever it is shut off, I am unable to enable it. The only way to re-enable is to remove the add-on then add it back to Firefox. Also, it becomes disabled for reasons that are unclear. Yes, I've disable it a few times, but currently, it becomes disabled without any action on my part.

Wish this would be addressed by the developers. Is it something on my end, or does the add-on have a bug?

I really want to like and use this add-on, but it currently is a moot point.