Map your (Vim) keys for web surfing, expand the browser with JavaScript

Since most people only know vimium for vim like website surfing and never heard about surfingkeys (which has much more power). From the author:

„Surfingkeys is another web browser(including Google Chrome, Chromium based browsers, Firefox, Safari) extension that provides keyboard-based navigation and control of the web in the spirit of the VIM editor. But it's not for VIM users only, it's for anyone who just needs some more shortcuts to his/her own functions.

Surfingkeys is created with all settings described in Javascript, so it's easy for anyone to map any keystrokes to his/her own defined Javascript function.“