The list all tabs button is missing

This button just went missing all of a sudden. I now have only one tab group, and I can't reach any of the other 3 groups I had before this happened.

I tried closing and restarting Firefox, which didn't help. I tried restoring the Profile from last week. This worked at first, but then I clicked the "list all tabs" button, went to another tab group, and BINGO - lost the "list all tabs" button again!

This is extremely annoying. I am now using a restored Profile, but I cannot click the "list all tabs" button any more without losing all the tabs but the ones in the tab group I go to. So I effectively don't have tab groups any more!

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