Fix typo in menu-debug.js
psuedo -> pseudo
@@ -1729,7 +1729,7 @@ _initSubTree: function () {
/*
Apply the "first-of-type" class to the first UL to mimic
- the ":first-of-type" CSS3 psuedo class.
+ the ":first-of-type" CSS3 pseudo class.
*/
if (this._aListElements[0]) {
