Not sure why this has a bunch of one star review, it works just fine for my purposes (Cookie Clicker). Though there are a couple of things that prevent me from rating this add-on five stars.

My biggest issue with this is the lack of an option to increase the amount of clicks per second. If this is possible, it would make this add-on immensely better.

My other issue with this add-on is not having hotkeys to disable or enable it. As others have pointed out, being able to disable the add-on would prevent accidents on other sites. For me it's not too important since I can just go into the add-ons manager and disable it from there. However, including this feature would be of great convenience.

Other than those two issues, this is a fine add-on which serves the purpose for any idle clicker games. I cannot understand the one star reviews for this add-on, perhaps there was some issue at the time others reviewed it but I have not encountered it. There are probably better programs, or hardware, out there, but for my situation it does what it's supposed to and does it nicely.