Bug 574821 - Add titlebar margin to browser-aero css for maximized windows - addresses issue with negative window origins on windows. r=Dao.

browser/themes/winstripe/browser/browser-aero.css

@@ -24,6 +24,11 @@
     background: transparent;
   }
 
+  /* the new titlebar requires this, or content will be clipped at the top of the screen. */
+  #main-window[sizemode="maximized"] {
+    margin-top: 8px;
+  }
+
   #main-window:not(:-moz-lwtheme)[inFullscreen="true"] {
     -moz-appearance: none;
     background-color: #556;