Once I've created a tab group, where do I find it to retrieve it?
I followed the instructions on how to create a tab group, and saved it with a group name. I closed Firefox and reopened it, but cannot find a way to retrieve the tab group I created.
פתרון נבחר
You just use the tabs group icon or the keyboard shortcut Ctrl + Shift + E
You may choose where to put that icon and it is probably by default on the top right on the navigation toolbar, otherwise use the new button 
and the customise option to find and if necessary reposition the icon.
The tabs goups probably are most effective when more than one tab group is created and used. The tab group sizes may be adjusted, so that stacked thumbnails show, or individual thumbnails display.
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פתרון נבחר
You just use the tabs group icon or the keyboard shortcut Ctrl + Shift + E
You may choose where to put that icon and it is probably by default on the top right on the navigation toolbar, otherwise use the new button and the customise option to find and if necessary reposition the icon.
The tabs goups probably are most effective when more than one tab group is created and used. The tab group sizes may be adjusted, so that stacked thumbnails show, or individual thumbnails display.