Tab Utilities
Tabs Outliner
Tree Style Tab
OneTab
Session Buddy
Duplicate Tabs Closer
Undo Close Tab
UndoClose
SplitUp!
Tab Stash
Tablerone
tabExtend
Tabli
Workona
Smart Tab Manager
Tab Session Manager
Tab UtilitiesTabs Outliner - Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works.
Tab Stash - Tab Stash is a browser extension that helps you keep your tabs straight, saved, and restore them later.
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
Tablerone - Browser extension for saving, organising, and exporting tabs. Save multiple tabs with one click. Get more done with a clean browser.
OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.
tabExtend - Easily save tabs and quickly create notes in your browser