无法识别的清单键＆＃39; gcm_sender_id＆＃39; ，Chrome扩展程序链接到fcm

Question

我正在尝试将Chrome扩展程序链接到firebase云消息传递，但我正在接受 无法识别的清单键＆＃39; gcm_sender_id＆＃39;加载扩展程序时出错 image of the error， 这是我的清单文件：

＆＃13;

＆＃13;

   {

  "manifest_version": 2,
  "name": "iQU",
  "description": "iQU",
  "version": "1.0",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "index.html"
  },
  "permissions": [],
  "content_security_policy": "script-src 'self' 'unsafe-eval' https://cdn.firebase.com https://*.firebaseio.com https://*.firebaseio.com; object-src 'self'; ",
  "web_accessible_resources": [
    "assets/css/*",
    "assets/js/*",
    "assets/fonts/*"
  ],
  "gcm_sender_id": "103953800507"
}

＆＃13;

＆＃13;

＆＃13;

有什么帮助吗？