Honestly, the number of times I switch apps when I meant to switch tabs in Firefox, I'd be pretty interested in a Firefox-based launcher/recent apps picker. Especially since Firefox has gotten better with the "open in an app" option in recent versions of Firefox/Android, I think it might be a powerful new launcher paradigm.

Ha. I just got a ZTE Open, mostly to hack on. It's cool, but not ready to be my primary phone yet.