Writing this with a completely neutral review to let people know that this exists more as a way to donate to the developer and show your thanks much in the same way that any other ad-blocker might ask for donations. This particular extension has been made obsolete since the registration code necessary to make it work is no longer available for purchase.

If you are so irate about this not working, I have wonderful news: you can spend all of around three seconds placing "12ft.io/" behind whatever address you are currently accessing. Crazy, right?