Examine source code of Twitter Profile Notes

{
  "description": "Twitter Profile Notes",
  "manifest_version": 2,
  "name": "Note+",
  "version": "1.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "*://twitter.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*"
      ],
      "js": [
        "profile.js"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9369d4ff-6b96-4406-8e70-22c6ed15f684}"
    }
  }
}