I have been using this Add-on for years, I am a Tab monster and I am always letting them get out of control. One click condense, once there I will often times right click in the history to selectively reopen the tabs (in a new tab) thus saving my history in order of appearance.

Love it! Thanks!
But, how to start a new tab group?! -> Just found an easy solution: just "import URLs" a new url with a description. See in "Export" on how to format it. Any imported url will be added to your list. Don't include all ;-)

excellent extension, well recommended

This addon is great, but it would be even cooler with more keyboard shortcuts(like send link to specified group etc.).

I'd say this is a "must have" addon.