I actually completely hide the textual menu with the addon Hide Menubar. I still leave the standard back, forward, reload and friends, but only because they're on the same bar as the address bar, which I pretty much always want visible.
I started doing this after realizing that the only elements of Firefox's UI that I actually use with any frequency is the address bar and quick search bar. For the rest of it, I'd rather just have a larger viewport. If I need the menus i just press ALT, which is consistent with the rest of a Windows Vista/7 UI that hides menubars. Incidentally, the most common reason for me to need the textual menus is to unclose a tab. This is a feature I need regularly, but not terribly frequently compared to most other functions. I hate that it's buried in the History menu - I just don't make that connection. It's also very hard to bind to mouse gestures in the common mouse gesture addons (Usability be damned, I heart my mouse gestures).