[alien_acorn]

How do you get the Firefox icon instead of the word "Firefox" in the orange drop-down button?

[kibwen]

There are probably several addons and themes to that end, here's one that seems reasonably popular:

https://addons.mozilla.org/en-US/firefox/addon/movable-firef...

[alexis-d]

It looks like it's Pentadactyl (an addon to use Fx with Vim-like key bindings) which provides this behaviour.