I had 4 Chrome windows with ~80 tabs each, mostly duplicates of the same Stack Overflow page. Tried OneTab (saves to a list - not what I wanted) and Workona (cloud sync, overkill).

So I wrote ~50 lines of vanilla JS. Click the toolbar icon → every duplicate tab across every window is removed (matched by URL) → survivors merge into one window → remaining tabs auto-group by hostname (collapsed).

Two permissions: tabs, tabGroups. No background activity, no server, no analytics. Whole source is in the README so you can audit it before installing.

Chrome Web Store: https://chromewebstore.google.com/detail/tab-vacuum/apdjhdjcejehjiomcolfgfgjhaedoieb

GitHub: https://github.com/mayhsundar/tab-vacuum
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