Middle clicking on the account name in the top navigation bar should open the profile page (in a new tab). Since the pull down menu was introduced today, middle clicking does not do anything anymore.
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The behavior of the popup is now a hover, clicking is a normal link that will take you to your profile (mobile users included).
Well, they've changed it from a link to a popup menu. And as far as I can tell, the middle click works only for links. (Can't say I like the change, though. I used to middle-click, too.)