Prospector: Tab Focus
About Prospector: Tab Focus
One of the Prospector experiments, Tab Focus makes it easy to visualize the tabs you have open as a tree based on the links you follow between pages.
Prospector is a collection of experiments from Mozilla Labs focused on analyzing, experimenting and prototyping enhancements for how you search and discover content with Firefox. We’re focused on three main areas: websites you've visited, tabs you're currently viewing, and pages you haven’t visited yet.