Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works. It allow organizing windows and tabs In hierarchies, annotate and comment them, close any tab or window for later in place, then reopen just as you select already open tabs. There is also browser crash resistance capabilities and ability to restore everything after crash with all structure untouched. And the tree style tabs feature, to see relations between tabs. Must have for everyone who have more than 20 open tabs. And a lifesaver for people who have more than 200.