Examine source code of googleadblock

{
  "manifest_version": 2,
  "name": "googleadblock",
  "version": "1.0",
  "description": "Adds a red border to all webpages matching mozilla.org.",
  "icons": {
    "48": "icons/nogoogle-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "googleadblock.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a01721c2-b68d-435c-8fbe-39d4bf0c777e}"
    }
  }
}