Examine source code of Google to Kanye West

{
  "manifest_version": 2,
  "name": "Google to Kanye West",
  "description": "We all like Kanye, so use Kanye instead of Google.",
  "version": "1.0",
  "web_accessible_resources": [
    "img/*.jpg"
  ],
  "icons": {
    "16": "/kanye16.png",
    "48": "/kanye48.png",
    "128": "/kanye128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/*"
      ],
      "css": [
        "main.css"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/kanye16.png",
      "48": "/kanye48.png",
      "128": "/kanye128.png"
    }
  },
  "permissions": [
    "activeTab"
  ]
}