Tab Dupe Block is a Chrome extension designed to enhance browser efficiency by preventing the opening of duplicate tabs. This tool automatically detects if a domain or URL is already open in another tab and switches the user to that tab instead of creating a duplicate. This feature helps streamline browsing sessions and minimizes clutter.

The extension offers flexible rules for managing tabs, allowing users to block duplicates by specific domains or exact links. Additionally, it includes options to whitelist certain domains or links, providing users with control over which duplicates to block. Users can choose to block all duplicates or only those added to a custom blocklist, making Tab Dupe Block a versatile tool for managing online activities.