Group-tab addon for firefox

I'm probably just entering the wrong search terms, but I'm pretty sure the firefox addons site has an addon that enables tabs in tabs.

For instance, a master tab for all news sites, one for all games sites, one for all programming, etc...

It's much easier to manage that way.

Does anybody know what it's called and where I can find this?

Solution 1:

I just installed Tree Style Tab on Firefox 3.5.2 (OS X). It's rather sweet! It gives you a hierarchical tab bar on the side of your browser window (which you can set to auto hide).

It doesn't look like it supports manual tab renaming so you'll have to use, say, google.com as your gmail/cal/reader/analytics/etc. holder.

Thanks for asking the question; wish I'd thought of looking for an add-on like this sooner.

Solution 2:

Tab Kit has some cool extras over Tree Style Tab, like coloring each group distinctly. Give both a try (but not at the same time!).