Czuch Czuckers: Do you mean version 3.01a (screenshot ) or maybe 3.0a2?
I installed that version on my work computer; now I have both version 2 and version 3 installed and can run either depending on which icon I click (but I'm not running the "Minefield" version).

Anyway, barring extension/configuration problems, I believe you can uninstall all versions, download the version you prefer, and install only that version (maybe you'll have to reinstall extensions too).