How to set Mail.app to always open URL's in the external browser in the background?

I'm on Mountain Lion and in Apple Mail whenever I click a link in an email it opens my browser in front of Mail. I'd like to keep reading the email and open all links behind Mail, then switch to my browser and read the links later. I'm aware of right clicking a link and selecting "Open Link Behind Mail", and I know of the "command-click" method to achieve that. But I want that to be the default behavior, so I don't have to do any extra clicking, I just want the links to **always** open in the background. How do I set it to do that?