Chrome has a really fantastic feature called "Tab Groups" - it's pretty self explanatory but it basically allows you to quickly group related sets of tabs. This is an incredibly useful feature but it seems Firefox hasn't got anything like it. I've tried a few of the third party add-ons such as Tree-Style-Tabs but they're all over-complicated, take up too much screen real estate or change the way tabs operate. Is adding simple Tab Grouping functionality on the Firefox roadmap? If not - has anyone found any good add-ons to replicate the Chrome functionality?