Yeah, update: I'm out - uninstalling. I cannot stand having to delete the STG folder from my desktop every day I turn my computer on. The bit of good I get from this extension is not worth the hassle.

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Pretty good, but ONE MADDENING THING! it covers my desktop with STG-backups-FF folders. Wish I could select someplace these should go. I hate having to toss them daily.

It's also easy to forget STG is there - that's not necessarily a bad thing: it's not intrusive other than the backups. But it's hard to get the value if you forget you have the groups, or go on using your default tab group like it's the only set of tabs available.