WebExtension to clean up duplicate tabs. Tested in Firefox.
When a tab's location changes, it checks against currently open tabs in the same window. On a match, one is made active and the other is removed.
Great for tab hoarders that revisit pages that are already open in a different tab.
Requires the following permissions:
tabs: To query tabs and check for matching URLs.cookies: To check that two matching tabs are in the same cookie store (i.e., in the same contextual identity). Prevents closing tabs being used in other contexts, such as in different containers.notifications: To notify a user that their current tab was replaced with an existing one.storage: To store extension settings.