What counts as a duplicate?
A useful duplicate check compares open page addresses, not merely similar titles. Two pages can share a title while representing different documents, search results or account states. Conversely, an address with a tracking parameter may look different even when the underlying page feels the same.
Treat the duplicate list as a review queue. Keep the copy that contains the state you need, such as a paused video position, a partially completed form or useful Back history.
Safari's close commands are broader
Safari can close selected tabs, but it has no dedicated list of duplicate URLs. Close Other Tabs is not a duplicate finder: it can also close unrelated pages.
TabCaptain marks repeated URLs and brings them together in the Duplicates view. Review the copies, close individual tabs with ×, or use Close duplicates to clean up the list in one action.
Clean up safely
Before bulk cleanup, save important form work, confirm downloads have finished and note any page whose temporary state matters. If the whole collection may be needed later, a saved session provides a separate recovery point before you close the tabs.
- Review repeated pages before a bulk action.
- Do not treat matching titles alone as proof.
- Keep the tab with the state you need.
- Close tabs individually when you need to choose exactly which copy stays.