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.

Session Buddy - Manage Your Browser Sessions

Tabs Outliner - Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works.

Tablerone - Browser extension for saving, organising, and exporting tabs. Save multiple tabs with one click. Get more done with a clean browser.

SplitUp! - A fun and elegant tab manager

One Tab Group - One Tab Group is a Chrome extension alternative to OneTab/Session Buddy, that allows you to manage your tabs & tab groups in one place. One click to aggregate all tabs & tab groups into one session.