This is a terrific, must-have add-on for researchers and people with busy, creative lives. As a researcher, graphic designer and IT professional, I am often involved in dozens of projects at once and it's not unusual to have dozens of tabs (often several dozens) for each project. This add-on allows me to segregate them into logical groups and call up and use just the group I need, organized the way I want.

In locating parts and ideas for building a custom PC for a client, for example, I may open and use dozens of tabs; with this add-on, I can keep them all grouped under the client's name and share them with the client.

I work with Adobe Illustrator a lot; with this add-on, I can organize the pages, tutorials, online graphic resources, etc., in logical groups, available at the click of an icon. These are just a couple of examples; I have over 25 such groups right now.

I was using Tab Groups by quicksaver (a thousand thanks to you, my friend!) and actually stopped upgrading Firefox at v54 so that I could keep using this essential (for me) functionality. Glad to finally find a worthy successor to that add-on so I can keep working the most efficient way for me! I can hardly recommend this add-on highly enough!