Snippet from the Mozilla’s Asa Dotzler post:
I’m sitting here with my Leopard preview install DVD and I can’t work up the courage to just blow away Tiger on my only Mac (my primary machine — a MBP.) Heck, I don’t even know if Firefox runs on Leopard.
My first thought was to install Leopard under Parallels on my MBP — just the way I do Vista under VMWare on my Thinkpad. Apparently that’s not possible since Leopard will only install on genuine Mac hardware and Parallels is virtual hardware, even if it’s running on a Mac.