Tab-Killer is a free Chrome extension developed by marinebox. It falls under the category of Browsers and is specifically listed as an Add-ons & Tools subcategory. This extension is designed to help users organize their tabs by closing duplicate tabs and providing other useful features.

One of the main features of Tab-Killer is the ability to show the number of duplicate tabs on the extension's icon. This allows users to quickly identify and manage duplicate tabs without having to manually search for them.

Another useful feature is the automatic closure of duplicate tabs. When multiple tabs have the same URL, Tab-Killer will close all but one, decluttering the browser window and improving overall browsing efficiency.

In addition to managing duplicate tabs, Tab-Killer offers the option to close all tabs that match a specified keyword or have a designated domain. This feature is particularly helpful for users who want to quickly close tabs related to a specific topic or website.

Tab-Killer also provides the ability to rearrange tabs based on their URL, allowing users to easily organize their browsing experience and access their desired tabs more efficiently.

Lastly, Tab-Killer includes a whitelist and history feature, giving users more control over their tab management and browsing experience.

Overall, Tab-Killer is a useful Chrome extension for users who want to efficiently manage their tabs, close duplicates, and organize their browsing experience. It offers several features that make tab management easier and more streamlined. Any bug reports, feature requests, or pull requests are welcomed on the developer's GitHub page.