Duplicate Tabs Closer

Tracking since Jun 11, 2026.

Changelog

• Jun 23, 2026
  description

  Duplicate Tabs Closer detects and closes duplicate tabs automatically, or displays them in a panel for manual review. 
  
  WHAT IT DOES
  
  When you open a URL that is already open in another tab, Duplicate Tabs Closer can close it immediately or show it in the panel so you decide. A badge on the extension icon always tells you how many duplicate tabs are currently open.
  
  TWO WAYS TO WORK
  
  Auto-close mode: the duplicate tab is closed the moment it is detected. The original tab can be activated automatically, moved to the position of the closed tab, or left as-is.
  
  Manual mode: duplicate tabs are listed in the panel. You close them individually or all at once.
  
  SMART DETECTION
  
  The extension compares tabs based on their URL, but you can adjust what counts as a match:
  
  Ignore case in the URL
  Ignore the www prefix in the domain
  Ignore the hash part of the URL
  Ignore the query string
  Ignore the entire path (compare only the domain)
  Compare by page title instead of or in addition to the URL
  Set a title similarity threshold for fuzzy title matching
  Define URL pattern rules: any two tabs matching the same wildcard pattern are treated as duplicates, even if their full URLs differ
  Define title pattern rules: same idea, applied to page titles
  PRIORITY RULES
  
  When a duplicate is detected, you control which tab is kept:
  
  Keep the older tab (default) or the newer tab
  Keep the tab with HTTPS when one is HTTP and one is HTTPS
  Always keep the pinned tab
  Keep and reload the older tab with the newer URL (useful for redirects)
  WHITELISTED URLs
  
  Tabs matching a whitelist pattern are never auto-closed. They still appear in the duplicate list with an indicator, but the extension leaves them open.
  
  SCOPE
  
  Search for duplicates only in the active window, or across all open windows. On Firefox with Multi-Account Containers, you can also limit detection to tabs in the same container.
  
  POPUP PANEL
  
  The popup shows the current list of duplicate tabs. Click a tab to jump to it. Close individual tabs or all at once. The panel can be collapsed to show only the duplicate list, and sections can be pinned to stay visible in compact mode.
  
  CUSTOMIZATION
  
  Visual themes: Sky, Sage, Rose, Amber, Slate, Violet, Ocean Night, Charcoal, Midnight Purple, Dark Teal, OLED Black
  Custom badge colors for duplicate and no-duplicate states
  Option to open the popup automatically when a new duplicate is detected
  Option to close the popup after clicking Close All
  KEYBOARD SHORTCUTS
  
  No default shortcuts are set to avoid conflicts with browser built-ins. You can assign shortcuts for:
  
  Close all duplicate tabs
  Toggle between auto-close and manual mode
  INTENTIONAL DUPLICATES
  
  Tabs opened on purpose using the browser's built-in Duplicate Tab command are never auto-closed.
  
  PRIVACY
  
  The extension operates entirely locally. No data is collected, transmitted, or stored outside your browser.
  
  RELEASE NOTES
  
  https://github.com/Peuj/duplicate-tabs-closer/releases
  
  BUG REPORTS AND FEATURE REQUESTS
  
  https://github.com/Peuj/duplicate-tabs-closer/issues

  Duplicate Tabs Closer detects and closes duplicate tabs automatically, or displays them in a panel for manual review.
  
  WHAT IT DOES
  
  When you open a URL that is already open in another tab, Duplicate Tabs Closer can close it immediately or show it in the panel so you decide. A badge on the extension icon always tells you how many duplicate tabs are currently open.
  
  TWO WAYS TO WORK
  
  Auto-close mode: the duplicate tab is closed the moment it is detected. The original tab can be activated automatically, moved to the position of the closed tab, or left as-is.
  
  Manual mode: duplicate tabs are listed in the panel. You close them individually or all at once.
  
  SMART DETECTION
  
  The extension compares tabs based on their URL, but you can adjust what counts as a match:
  
  Ignore case in the URL
  Ignore the www prefix in the domain
  Ignore the hash part of the URL
  Ignore the query string
  Ignore the entire path (compare only the domain)
  Compare by page title instead of or in addition to the URL
  Set a title similarity threshold for fuzzy title matching
  Define URL pattern rules: any two tabs matching the same wildcard pattern are treated as duplicates, even if their full URLs differ
  Define title pattern rules: same idea, applied to page titles
  
  PRIORITY RULES
  
  When a duplicate is detected, you control which tab is kept:
  
  Keep the older tab (default) or the newer tab
  Keep the tab with HTTPS when one is HTTP and one is HTTPS
  Always keep the pinned tab
  Prioritize the active window: when duplicates span multiple windows, keep the tab in the currently focused window even if age-based priority would close it (requires Scope set to All windows)
  Keep and reload the older tab with the newer URL (useful for redirects)
  
  WHITELISTED URLs
  
  Tabs matching a whitelist pattern are never auto-closed. They still appear in the duplicate list with an indicator, but the extension leaves them open.
  
  SCOPE
  
  Search for duplicates only in the active window, or across all open windows. On Firefox with Multi-Account Containers, you can also limit detection to tabs in the same container.
  
  POPUP PANEL
  
  The popup shows the current list of duplicate tabs. Click a tab to jump to it. Close individual tabs or all at once. Toggle a grouped view to see duplicate tabs organized by URL. The panel can be collapsed to show only the duplicate list, and sections can be pinned to stay visible in compact mode.
  
  CUSTOMIZATION
  
  Visual themes: Sky, Sage, Rose, Amber, Slate, Violet, Ocean Night, Charcoal, Midnight Purple, Dark Teal, OLED Black
  Custom badge colors for duplicate and no-duplicate states
  Option to open the popup automatically when a new duplicate is detected
  Option to close the popup after clicking Close All
  
  KEYBOARD SHORTCUTS
  
  No default shortcuts are set to avoid conflicts with browser built-ins. You can assign shortcuts for:
  
  Close all duplicate tabs
  Toggle between auto-close and manual mode
  Pause or resume duplicate tab monitoring
  
  INTENTIONAL DUPLICATES
  
  Tabs opened on purpose using the browser's built-in Duplicate Tab command are never auto-closed.
  
  PRIVACY
  
  The extension operates entirely locally. No data is collected, transmitted, or stored outside your browser.
  
  RELEASE NOTES
  
  https://github.com/Peuj/duplicate-tabs-closer/releases
  
  BUG REPORTS AND FEATURE REQUESTS
  
  https://github.com/Peuj/duplicate-tabs-closer/issues

Permissions & access

Permissions

tabswebNavigationstorage

Host access

None declared

Screenshots