I'd like to see a one-finger method for switching tabs in the next version. What I mean by this is the following: On larger phones (pretty much all the new phones), its hard (for most people) to reach the top of the screen to toggle the tab changing button.

Besides that, changing a tab is at least a 2-tap process. The Chrome browser allows tab switching by swiping the edge of the screen; Dolphin HD allows tab switching by pressing the volume buttons; even the default browser allows faster tab switching than firefox as the navigation bar can be accessed by pivoting on the edge of the screen (not on by default).

I use firefox on the desktop, and I'd love to use it as my default browser on android as well. For now, I'm using Chrome. Works well enough for me.