Same problem here -- I uninstalled the extensions and reinstalled to start from a clean tree...now I don't have a license anymore?

Amazing! Apparently I had 47608 tabs outliner tabs.

17271 distinct urls.

1026 duplicates with children were NOT removed.

29311 duplicates with no children were removed.
18297 tabsoutliner tabs were kept

Kinda makes me wonder about the 1k unremoved, but damn it cleared nearly 30,000 nodes!