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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.
Sidebery - Manage your tabs and bookmarks in sidebar.
Workona - A better way to work in the browser.
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
Session Buddy - Manage Your Browser Sessions
Firefox Multi-account Containers - Sign in to two different accounts on the same site