UPDATE: 03/11/2019
Thank you so much for adding group-sorting options and fast switching! I have, at last, fully migrated to this add-on from Firefox Multi-Account Containers for group sorting alone. Got tired of waiting years for something so simple–yet you implemented it right away! Love the customization options for groups–colors, icons, etc. And it works great with Tab Suspender to save memory. Upped to five stars!

Latest Suggestions:
• I love how one group is shown at a time. On the other hand, it would be nifty to have the option to show more than one group at a time.
• It would be great if there were symbol options for the group-switching icon similar to Firefox Containers to easily identify the group selected.
• When moving a tab to another group, one must first click within the web page of the tab being moved. It would be nice if it would work when just clicking the tab.

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ORIGINAL REVIEW:
Finally, a comparable replacement for Tab Groups! It appears to make due without the tab-hiding API by closing tabs (rather than hiding them) when switching groups. This is what I have been waiting for.

Suggestions / Requests
• Please add a way to reorder and sort tab groups by name in group list.
• Please show the name of the currently-selected group next to the add-on icon.