DupeNope

Prevents duplicate tabs by automatically closing duplicate URLs

Tame the chaos of duplicate tabs. DupeNope watches for tabs you already have open. When you accidentally open the same URL again, it quietly removes the duplicate so you can stay focused on what matters. Why you'll love it - Smart deduplication - Pick between two modes: close the new tab and focus the existing one (recommended), or close the old tab and continue with the new one. - Domain exclusions - Some sites legitimately need duplicate tabs, like Slack, monitoring dashboards, or multi-account web apps. Add them to the exclusions list and DupeNope leaves them alone. - Clean settings page - Light and dark themes, responsive layout, no popup surprises. - Multilingual - Available in English, Spanish, French, and Brazilian Portuguese. Your privacy is the priority - Runs locally - DupeNope works entirely on your device. - No tracking - We do not collect, store, or transmit your browsing data, URLs, or usage metrics. - Local storage - All settings live in your browser, never on a server. Free - No cost - DupeNope is completely free to use. - If it helps you tame the chaos, you can support development with a coffee from the Settings page.