NPP_New在少数网页中未被调用(Chrome和Safari)

我正在尝试从Chrome/Safari扩展的内容/注入脚本访问NPAPI插件。

嵌入插件对象和访问方法的代码。

var newElement = document.createElement("embed");  
newElement.id = "myPluginID";  
newElement.type = "application/x-mychrome-plugin";
var newAttr = document.createAttribute("hidden");
newAttr.nodeValue = "true"
newElement.setAttributeNode(newAttr);
newElement.style.zIndex = "-1";
newElement.style.position = "absolute"; 
newElement.style.top = "0px";
document.documentElement.appendChild(newElement);
plugin = document.getElementById("myPluginID"); //this shows as HTML element when evaluated in JavaScript console.


   plugin.myPluginMethod() // this shows as undefined instead of native code(When evaluated in JavaScript console),for pages where NPP_New is not called.

这适用于大多数网页,但对于少数网页(例如:www.stumbleon.com),不调用NPP_New(使用Xcode 4进行调试),也不创建可脚本化对象,并且所有插件方法都未定义。

任何输入。