Firefox with vim keys

Vimperator extension sets the firefox to a modal vim style. People used to vim will find it just very useful.
Like, over the command mode:
gg - goes to the top of page. No Separate Page Up/Home Keys number of times, which one rarely uses.
G - goes to the bottom of the page.
: open url opens the url.

The only problem I faced was,I had gmail on and it uses vim style navigation, ( j for down, k for up) and when press j for gmail, vimperator understood for itself and it was scrolling.
I thought, it must have been designed as window mode, so let me switch to the gmail window. and did CTRL-W-W.
Well, firefox tookover and closed the window!
It was fun tough.
Here is the list of commands supported.