Wonders of the middle mouse button

My installation of Firefox seems to have stopped listening to the target attribute of hyperlinks. Thankfully, the middle mouse button comes to the rescue. Clicking on a link with the middle button opens it the destination page up in a new window or tab, depending on how you set your defaults. The behaviour goes even further than this: the trusty middle mouse button does the same for bookmarks and the Google search bar; all very useful. And its not just a Firefox thing either. IE7 does the same thing for web page hyperlinks and bookmarks while in Opera, it is limited links on web pages.