I never bothered to learn that stuff before I started using Vimperator. I tend to prefer buffers over tabs for dealing with multiple files in a single Vim instance, so I never had much use for tab-related keybindings until I started using a vi-like interface for a tabbed browser.
You know, if I had a terminal emulator that I could run vim with 24-bit colour depth in, that would go a long way towards turning me from the path of heresy.
This also works with Vimperator. I'm now thinking about installing that Firefox extension that gives all the tabs numbers, for ease of reference. Alas, I don't remember what it was called -- but I'm sure I'll find it again.