A very well designed and reasonably intuitive extension. Adds a lot of features for users who prefer or need more options to organize their tabs as well as save time and a few clicks. A good deal of customization for the appearance and order of features in the menu are available too.

I recommend users read the Help section within the options to get a full overview and idea about what each option does.

In terms of feature improvements, one hopes this would implement many of the features of its erstwhile competitors like TabMixPlus such as session management, multi-row tabs as well as a dropdown for recently closed tabs (that can be re-opened). However, much of these are dependent on now unavailable APIs and methods used in previous versions of Firefox.