Ctrl-Tab in Firefox!

Ctrl-Tab is a Firefox add-on to visually switch between tabs. The Ctrl-Tab shortcut already works in Firefox, but once the add-on is installed, you get a preview of all tabs in the currently active window. You can also get a grid with a preview of all tabs open in Firefox with "Command - Shift - A". You can get more info or download the add-on here from Mozilla's website.

Screenshot of "All Tabs"