Examine source code of GadLight

{
  "name": "GadLight",
  "short_name": "GadLight",
  "version": "0.1.1",
  "description": "Clearly highlight Google ads on google search",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "https://www.google.com/*",
    "activeTab",
    "storage"
  ],
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "run_at": "document_idle",
      "css": [
        "css/fix.css"
      ]
    }
  ],
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "manifest_version": 2
}