Windows/Mac/Unix (Firefox): Firefox extension Tab Groups lets you organize your Firefox tabs into - you guessed it - more tabs!
Just create and name your high level tab groups, then organize your existing tabs into new groups or move them between groups with a simple drag and drop. Tab Groups is a very new extension (still in alpha, in fact), but the core functionality is already there and so far it's worked wonders for me. There are, however, a few kinks that require the proper setup for Tab Groups to work.
Namely, Tab Groups doesn't currently work with the Tab Mix Plus session restore - but it works perfectly with Firefox 2's built-in Session Manager. There are a couple of other limitations you might want to check out before you dive in head first, but none of them posed a major problem to me - especially since I'm so excited to get the tab grouping functionality.
If you're used to having 20+ tabs open at a time, this kind of organization tool can come in very handy, especially if you're limited by a small monitor.
Tab Groups [via CyberNet News]
