Auto Group Tabs is a google chrome extension to automatically group your browser tabs. You have to install "Auto Group Tabs" from the chrome store. Once installed, you can group your tabs by pressing Ctrl+Shift+Y or Cmd+Shift+Y on a Mac.
See how long your tabs have been open! Too many tabs open? Can't remember how long it's been since you last looked at that webpage? TabTimer shows a running timer in each open tab to remind you how long you have had the same tab open.