Tab Grouper is a free Chrome extension developed by Mark Harrison. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This extension allows users to automatically group tabs that match a given URL pattern.

With Tab Grouper, you can create rules for each website, specifying the URL pattern to match, the name of the tab group, and even choose a color for the group. As you browse the web, the extension will identify websites that match your rules and add them to the appropriate tab groups. For example, you can have all your Jira tickets in one group, all Amazon pages in another, and all Google search results in a separate group.

The extension requires permissions to read your browsing history or tabs to function effectively. It reads the addresses of the sites you visit and matches them against the rules you set, automatically grouping tabs based on those rules. It's important to note that Tab Grouper does not store or transmit your browsing history anywhere.