I would LOVE an on/off button! I need to manually switch the extension on and off, as there are many "good" blue checkmarks on my main feed that I want to keep (retweeted by those I follow).

EDIT: So how I use it is point the browser at some juicy tweet, with lots of dumb blue checkmark replies, and then switch the extension on in the Add-ons manager. Then I get logged out after a while, log back in and repeat.

Great thing about the extension is that it caches all the accounts to block, so even if you get logged out, and logged out you will be, when you get back, the list just waits for you to reactivate the extension.

Really satisfying!