This used to be a great add-on, but now at least weekly if not every few days (I haven't kept track) it will randomly open a new tab (stealing my attention) nagging at me to pay for a subscription. On top of that I am finding that I have to disable this add-on for more and more websites from glitches it causes. Websites that don't really even have ad's. Like the most recent one, eBay. I was having problems with eBay loading. And after resetting Firefox, I started disabling add-ons. After I disabled Adblock suddenly eBay loads perfectly, and even faster than it has in a long time. Yes I tried reinstalling it, then I have the same problems again. This add-on has passed it's time. It has become what it was designed to block.
Edit: After using my browser without adblock for a few hours, every site is noticeably faster. Interesting, there was a time when adblock would speed things up... Evidently that has changed. Other reviews have a response about how you initiate that popup when there is an update. Perhaps limit how many times that can pop-up because it happened far more than once a month.