Mozilla is working on a new feature called "Tab Candy," that shows an overview of all tabs to allow you to quickly locate and switch between them. Tab Candy also lets you group tabs to organize your work flow. You can create a group for your vacation, work, recipes, games and social sites, however it makes sense to you to group tabs. Drag two tabs together to create a group to keep related tabs together. When you switch to a grouped tab only the relevant tabs are shown in the tab bar, which helps you focus on what you want.
"Tap Option-Space on Mac or Control-Space on Windows to zoom out and see thumbnails of all open tabs. Click on one to zoom back in. It's a quick visual way to search for that one tab you need with work research or directions to the restaurant."