Rated 5 out of 5 stars

Does what it says, however I always have a problem with FF using alt+enter instead of ctrl+enter and theres no addon to solve it.
If you want some enhanced fucntionality, use Tab Mix Plus for tab opening, closing and ctrl+tab to switch to previously used tab.
Tree Style Tab can visually organise the tabs by origin.

This review is for a previous version of the add-on (1.0-beta.1-signed).