Back/Forward Dropdown Remover is a tiny extension that removes the dropdown arrows from Firefox's Back and Forward buttons.
It's now compatible with Firefox 0.9.x and 1.0.x, as well as
Deer Park development versions and Firefox 1.5 beta onwards. I figured out compatibility with 1.0.x, despite it requiring a more complex, obsolete extension packaging system, mainly because lots of people couldn't read
Requires: Firefox: Deer Park - Deer Park.
The userChrome CSS code itself has been floating around for ages on various Firefox tips sites; I just packaged it up into an extension for ease of installation, and in order to gain some limited extension-making mojo.