TooManyTabs - Ever tried having 20 tabs or more open in Chrome?
SplitUp! - A fun and elegant tab manager
Dustman - Firefox extension to close unused tabs.
Tab Stash - Tab Stash is a browser extension that helps you keep your tabs straight, saved, and restore them later.
Pocket - When you find something you want to view later, put it in Pocket.
Smart Tab Manager - Smart Tab Manager is a browser extension that allows you to save & restore your browser sessions.