Adding the following to your script injection will enable you to make page specific customizations:
function temp(){
        if (!top.noodle) {
               setTimeout(temp, 100);
        }
        if (top.noodle.custom) {
               return;
        }
        top.noodle.custom = function (){
               var doc=top.noodle.mainWindow().document;
               var url=doc.location.href;
               //your code go here
        }
}
temp();