This extension has the feature to organize tabs, such as closing duplicate tabs, and so on. You can use the following features. 1. Show the numbers of duplicate tabs on the extension's icon. 2. When you have the tabs that have the same URL, this extension leaves only one and closes the others. 3. Close all tabs whose URL is matched with the keyword you specified. 4. Close all tabs which have the domain you designated. 5. Rearrange tabs by URL. 6. Whitelist 7. History Any bug reports, feature requests, or pull request is always welcome. https://github.com/marinebox/tab-killer