You can close duplicate tabs from the right click menu on tabs.

You can check duplicates by

• URL
• URL without Hash
• Tile

Pinned tabs are closed if and only if the right click menu is opened on pinned tabs.
Optional notifications show progress.

For addons developers:
You can use this addon through sendMessage.
For details, see README.

Install

• License: Mozilla Public License 2.0
• Weekly downloads: 1
• Average daily users: 9
• Rating: 3.3333/5 of 3 ratings
• Created: 2017-06-19 14:08:22
• Last updated: 2019-05-06 17:48:42
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/clicktabuniq/
• API: {e3e32590-2c56-405d-9f0f-9dc571a87d67}