Yesterday, I discovered that Firefox 1.0 on Mac OS X emulates a right click if I make a long click on the left (and only!) button. I didn't observe that behavior on Windows XP or Fedora Core 2. That's quite handy because I mostly use the trackpad on my PowerBook.
That's great to see that Firefox on Mac OS X tries to provide the same user experience than Aqua. I'm looking forward to Firefox 1.x releases which should increase compliance to the Human Interface Guidelines according to the new roadmap.
(Note to myself: I need to try Camino)