Chrome: Google Chrome has plenty of keyboard shortcuts for getting around the web, but it's not all-inclusive. For example, you can't easily disable extensions, delete a session, or instantly kill a set of tabs. Ferro is an extension that adds lots of keyboard-specific commands to Chrome.
Ferro works rather like an app launcher. Launch it using a keyboard shortcut (Alt+Shift+F), and Ferro opens up a command page where you can input all sorts of commands. Just start typing what you want, and Ferro automatically starts searching through its own commands, your open tabs, saved sessions, bookmarks and history to offer you suggestions. If you're a keyboard junkie who hates using your mouse, Ferro's well worth a look.
Ferro [via One Thing Well]