I wrote Ad muncher and they provided no help, said it was working on Opera 21 when it was bad. So I downloaded the extension Adblock Plus, which is quite good. And then added the Disconnect extension. (Which increases the power of the ad blocking). Both are in the Opera add-on store, and together they are terrific on blocking ads in Opera 21. I believe you can set AdMuncher to not work in Opera 21. What I did was just set up AdBlock Plus in my other browsers (Opera 12, Chrome, Firefox, and Disconnect where it was available), and stopped using Admuncher, even though I'd paid for it years ago. Good luck on getting Opera to work on Opera 12 ;). I don't think it's gonna happen, but I understand your mail situation. It's a complicating factor. I use Thunderbird, and it's quite good. And gmail, which can open in Opera 21 tabs, so mail-wise it's going okay for me.
