For those of you who going mouseless in Firefox using Vimperator, here’s a good tip that has solved some problems for me.
Use Pass Through Mode by hitting ctrl-z to disable Vimperator on the current page to get normal operation of your keys. This is especially helpful for flash players that need keyboard input or web apps like Gmail that have their own keyboard shortcuts. Then just hit the escape key to return to using Vimperator.
Ctrl-z : Enters pass through mode.
Esc : Escapes pass through mode.