I use Firefox mainly and Chrome/IE for testing sometimes. Firefox has been pretty solid; however, one really annoying change in v22 is that it blows up the default zoom level. That makes websites look very big. They said it's honoring the DDP setting on Windows and for HiRes monitor, but it looks like a bug or a misguided feature. I really hope they revert the change. I'm tired of hitting ctrl-- to zoom out on every site.