User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 Build ID: 20120924030626 Expected results: Currently there is no way to disable this intrusive feature, which is why users have to resort to add-ons like Switch to Tab no more and switch-to-tab Blacklist, together they have more than 5000 users. On top of that Switch to Tab no more is currently busted, probably due to the changes in bug 781588 Just like Panorama, the New Tab page, PDF reader and other features in firefox this needs to have a separate preference so it can easily be disabled if the user wishes to do so.