[Moo] Problem using every function on navigator.plugins array

[4fingers]

Hi,
I was just wondering why I am getting an error when I try and use every
() on the navigator.plugins array.
At the moment this code returns "navigator.plugins.each is not a
function":

navigator.plugins.each(function(item, index){
     if (item.name.indexOf("QuickTime") >= 0){
        return true;
    }
});

I thought navigator.plugins was an array, in which case why doesn't it
like me using each() ?

Thanks