asdf-jkl Firefox Extension

From Lifehacker

Windows/Mac/Linux (Firefox): The asdf-jkl Firefox extension adds tooltips to the fox's chrome that display keyboard shortcuts associated with the item your mouse pointer is hovering over.

For example, the address bar shortcut is Cmd+L, as pictured. (It's Ctrl+L for Windows peeps, so the tooltips are platform-aware, too.) Also asdf-jkl adds a Keyboard shorcuts item on Firefox's View menu for quick lookups of common shortcuts. This extension is a fanastic reminder/teaching tool for users who want to learn their way around the chrome via the keyboard. The asdf-jkl extension is a free download, works in conjunction with Firefox. — Gina Trapani

asdf-jkl [Google Code]