Always open new tabs to the right of the current one(which is not the same as setting browser.tabs.insertRelatedAfterCurrent to true). You can however get the default behaviour by: configuring the + button in the tab bar to not open tabs to the right of the current one(see addon preferences) using the ctrl-alt-t keyboard shortcut to open a new tab
Replaces the "Undo Close Tab" menu item with the "Recently Closed Tabs" sub-menu. Admittedly, this add-on doesn't do much, but ...
Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works. It allow organizing windows and t ...
Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focu ...
Toolbar button to close the current tab. Works on the newest version of Firefox.
Duplicate Tabs Closer detects and closes duplicate tabs.
Displays how many tabs are open. The count includes tabs from all windows. Also indicates how many tabs actually have content ...
The ApPHP Tabs is a simple PHP script that generates multilevel menu control which consists of nice-looking tabs. It may be us ...
Open Bookmarks/History/Homepage/URL/Search in new tabs, and more utilities for tabbed browsing, including open tab next, focus ...