Clusterfudge от ashurtech

To feel the power, define some 'clusters' , with a name, a URL pattern to match and a color that will be used to highlight this cluster's tabs. The title of tabs matching a configured cluster will be prefixed with the configured name and when active the tab will colored as per your configuration, making it much easier to cope with an otherwise confusing mess.
And if that wasn't enough to win you over, if you are browsing http://mainapp.cluster1.something.com/specific/page you'llfind options in teh context menu to browse to the equivalent in the other clusters or all clusters!