Examine source code of Google Search Adblocker

{
  "manifest_version": 2,
  "name": "Google Search Adblocker",
  "version": "1.0",
  "description": "Removes Google Search Ads",
  "icons": {
    "48": "icons/48.png"
  },
  "content_scripts": [
    {
      "css": [
        "content.css"
      ],
      "run_at": "document_start",
      "matches": [
        "*://*.google.com/*"
      ]
    },
    {
      "js": [
        "display_how_many.js"
      ],
      "run_at": "document_end",
      "matches": [
        "*://*.google.com/*"
      ]
    }
  ]
}