怎么判断IE和火狐页面加载完成

下面这个是兼容多种浏览器的方案，自行测试下：
var target = this;
const STATE_STOP = Components.interfaces.nsIWebProgressListener.STATE_STOP;
const STATE_IS_WINDOW = Components.interfaces.nsIWebProgressListener.STATE_IS_WINDOW;
const STATE_IS_DOCUMENT = Components.interfaces.nsIWebProgressListener.STATE_IS_DOCUMENT;
const locationChangeListener = {
onStatusChange: function(){},
onProgressChange: function(){},
onLocationChange: function(aWebProgress, aRequest, aLocation){},
onStateChange: function(aWebProgress, aRequest, aFlag, aStatus){
if((aFlag & STATE_STOP) && (aFlag & STATE_IS_WINDOW)){

//Do something in here

}
},
onSecurityChange: function(){}
};
gBrowser.addProgressListener(locationChangeListener);