Look, when this Add-on works, it works really well. I have used it for years with no issues. The problem is, after the most recent updates, something broke, and it broke bad.

As many others have pointed out, Firefox will not run properly with this add-on in its current form. Reinstalling or resetting the data helps in the immediate short term, but within a day or two, you will have issues again.

For the sake of the developers, I sincerely hope they can fix the issue. For now, I'm afraid I have to leave this disabled until whatever the problem is gets fixed.

EDIT: It's been about 2 months and I'm afraid to say that this add-on is still very very broken. I cant tell you how or why, but invariably (even after a fresh install) It will slow Firefox down to a crawl after being active for a day or so.

Further, every time this happens it causes my computer to freeze on shut down and start up. Ill have to power cycle a few times to get things working again. This has happened 100% of the time ever since the issues with this Add-on have started. It is fixed 100% of the time when the add-on is disabled.

It saddens me greatly, but I think this is officially a lost cause.