Tab Tally
Displays how many tabs are open. The count includes tabs from all windows. Also indicates how many tabs actually have content loaded in them – for example, after restarting Firefox.
Undo Close Tab Replacement
Replaces the "Undo Close Tab" menu item with the "Recently Closed Tabs" sub-menu. Admittedly, this add-on doesn't do much, but ...
Tabs Outliner
Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works. It allow organizing windows and t ...
Tab Mix Plus
Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focu ...
Close Tab Button (Firefox Quantum add-on)
Toolbar button to close the current tab. Works on the newest version of Firefox.
Open Tabs Next to Current
Always open new tabs to the right of the current one(which is not the same as setting browser.tabs.insertRelatedAfterCurrent t ...
Duplicate Tabs Closer
Duplicate Tabs Closer detects and closes duplicate tabs.
ApPHP Tabs
The ApPHP Tabs is a simple PHP script that generates multilevel menu control which consists of nice-looking tabs. It may be us ...
Tab Utilities
Open Bookmarks/History/Homepage/URL/Search in new tabs, and more utilities for tabbed browsing, including open tab next, focus ...