Chrome: You won't find a shortage of tab management extensions out there, but Tabs Outliner hopes to help you manage tabs better by showing all your open tabs in a tree.
Tabs Outliner displays all of your open tabs in a hierarchical tree. That means you can see everything that's open in a simple little pop-up window.
What's better is that Tabs Outliner saves the tab, and its location, so you can close it and not worry about the open tab sucking resources, but still have it at the ready in Tabs Outliner. It's a handy solution, and if you're a tab-aholic, it makes managing all those open tabs a lot easier.
Tabs Outliner [Chrome Web Store]