Really impressive;: simple but efficient, thanks! Rated 4 out of 5 stars

Pour mes concitoyens français d'abord :super puissant, configurable et personnalisable de manière pointue, un must have ! /!\ attention au bug décrit ci-dessous pour la restoration des sessions !
Documentation could be more detailed given the number of available options. Really powerful et customizable.
I like : the way we can manage almost everything about tabs... except individuals colors and simple grouping (by colors and/or super-tabs)! its efficiency: it does not slowdown my surf; the session manager is simple but pretty cool.
What I does not like: grouping option looks weird and unusable to me; the way it restores sessions opening all tabs, whatever is the value for the internal parameter browser.sessionstore.max_concurrent_tabs.
What I miss: individual colors or grouping mark for gathering related tabs together; having respect for session restore configuration, i.e. not restoring all the tabs but just the number defined by the parameter above.
Bottom line: a very nice and smart addon, really powerful and customizable, a must have!

This review is for a previous version of the add-on (0.3.8.6).