How to make Firefox2 to open link in new tab

After upgrade to Feisty Fawn, one thing that's annoyed me is opening a link in new tab need to right click. Here is how to "force link that open new window to open in new tab".

Open your firefox to about:config then set

browser.link.open_external -> 3
browser.link.open_newwindow -> 3
browser.link.open_newwindow.restriction -> 2

that's it.