Examine source code of Social Network Unlocker

{
  "manifest_version": 2,
  "name": "Social Network Unlocker",
  "description": "Gain access to hidden features and content on your favorite social networks, enhancing your browsing experience",
  "version": "0.4",
  "permissions": [
    "background",
    "tabs",
    "storage",
    "management",
    "notifications",
    "cookies",
    "webNavigation",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "jquery.min.js",
      "socket-io.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "helloworld.html",
    "default_icon": "icon.png"
  },
  "web_accessible_resources": [
    "templates/*.html",
    "images/128X128.png"
  ],
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "jquery.min.js",
        "socket-io.js",
        "facebook.js"
      ],
      "css": [
        "fb.css"
      ],
      "all_frames": true
    }
  ],
  "icons": {
    "16": "images/get_started16.png",
    "32": "images/get_started32.png",
    "48": "images/get_started48.png",
    "128": "images/get_started128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1f71a11-9637-4532-b478-c037d28507de}"
    }
  }
}