I just got a new PC with Windows 7 on it and I'm trying to get it to work like my XP did with Firefox 3.6.

I've set up gmail to be the application that opens mailto: links, but whenever I click on a mailto: link, it opens in the current tab instead of a new tab or window. On my old PC, I was able to have Firefox open a new window with a new message in Gmail, but I cannot figure out any way to do the same thing in Firefox 4.