Chrome: If you've honed your Chrome keyboard chops but you still mouse around for extension shortcuts, ALT and the arrow keys make short work of navigating them.
Lifehacker reader suryamp shares a handy navigation trick. In Chrome the ALT keys highlights the wrench, Chrome's universal all-in-one menu system (and you can use shortcut letters to jump to menu options, though this isn't always obvious).
Once you've highlighted the wrench, however, you can use your keyboards direction keys to navigate over to the nearby extension icons and down into their menus. In the screenshot above I'm navigating to previously reviewed TabRocket. Thanks suryamp!