Chrome: If you’re looking for an automatic way to organize your tabs, Tab Grouper automatically sorts tabs by domain.
The extension is simple and works as promised immediately after installation. Whenever you launch a new tab it automatically sorts itself into the group for the domain it belongs to and then places itself alphabetically within those domain tabs. The only complaint we can lodge against the extension is that we’d like to be able to move the groupings (as we’re already in the habit of putting certain domains and web apps on certain sides of the tab bar).
Tab Grouper is free, works wherever Chrome does.