To have the time of your life use Mutltiple Tab Handler with Tree Style Tabs Rated 5 out of 5 stars

Superb add-on for anyone who is used to opening many tabs in a single session. Indispensable. Use with Tree Style Tabs and you'll be hooked. Then you can close off Trees.

Great productivity add-on.

I ran it on Windows 7, now on Linux Mint 14. Well maintained, 0 problems.

This review is for a previous version of the add-on (0.7.2012111301).