http://www.theinquirer.net/inquirer/news/1724583/firefox-tab-candy
http://www.v3.co.uk/v3/news/2267045/firefox-show-tab-candy-tool
http://www.azarask.in/blog/post/tabcandy/
Tab Candy 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. (video)