Bug 1146331 - Disable text selection for the titlebar of in-content preference subdialogs. r=Gijs

--HG--
extra : commitid : 9t7R9EenAkk

browser/themes/shared/incontentprefs/preferences.inc.css

@@ -322,6 +322,7 @@ description > html|a {
 
 #dialogTitle {
   text-align: center;
+  -moz-user-select: none;
 }
 
 .close-icon {