Examine source code of Scribd Unlocker

{
  "manifest_version": 2,
  "name": "Scribd Unlocker",
  "version": "2.0.0",
  "description": "This utility allows users to view document content on Scribd without registering or logging in.",
  "icons": {
    "16": "./scribd.com/assets/images/logo16.png",
    "48": "./scribd.com/assets/images/logo48.png",
    "128": "./scribd.com/assets/images/logo128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.scribd.com/*",
        "http://*.scribd.com/*"
      ],
      "js": [
        "./scribd.com/content.js"
      ]
    }
  ],
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "./general_logo_firefox.jpg",
    "default_popup": "./scribd.com/popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{182eddd8-d03a-4e96-85ae-db1f74a0ee61}"
    }
  }
}