Since Firefox 4 Panorama has enabled you to visually organize tabs into groups. You can see a video for how it works here. We find this feature very useful for organizing common browser tabs into easy to reference tab-groups. The only problem is understanding what tab-group you are using when "inside" of a particular group. We decided to fix this problem by creating a Firefox extension that simply adds the tab-group name to the title of all tabs in a particular tab-group. Voilà, fixed!