Javascript 例外情况；“组件不可用”；在窗口对象上迭代时'；s属性

我正在尝试使用插件SDK（Jetpack）将Google Chrome扩展转换为Firefox。以下代码（作为内容脚本运行）

在Firefox 5.0和6.0中运行时引发此异常：

Traceback (most recent call last):
File "sfc-bgcore.js", line 299, in null
File "resource://jid1-q4cqhvcl3sc4vq-at-jetpack-api-utils-lib/content/content-proxy.js", line 519, in null
for each (name in Object.keys(obj)) {
[Exception... "Component is not available"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: 
   resource://jid1-q4cqhvcl3sc4vq-at-jetpack-api-utils-lib/securable-module.js ->
   resource://jid1-q4cqhvcl3sc4vq-at-jetpack-api-utils-lib/content/content-proxy.js ::
   <TOP_LEVEL> :: 
   line 519"  data: no]

但是，如果我在Firefox的“Web控制台”中执行相同或类似的语句，则运行正常：

for (var property in window) { console.log(property); };

---

我无法通过通过“测试”按钮安装它，然后访问来复制它-控制台上打印了一些属性，然后显示消息“完成”，没有错误

测试用例代码：

exports.main = function(options, callbacks) {
    var pageMod = require("page-mod");
    pageMod.PageMod({
      include: "*.org",
      contentScript: 'for (property in window) {console.log(property)}; console.log("done");'
    });
};

for (var property in window) { console.log(property); };

exports.main = function(options, callbacks) {
    var pageMod = require("page-mod");
    pageMod.PageMod({
      include: "*.org",
      contentScript: 'for (property in window) {console.log(property)}; console.log("done");'
    });
};