Examine source code of Adwords Blocker

{
  "description": "Adwords Blocker",
  "manifest_version": 2,
  "name": "Adwords Blocker",
  "version": "1.0",
  "homepage_url": "https://chrome.google.com/webstore/detail/mdflplbkjejghnfhphcmnpempokgokha",
  "icons": {
    "48": "icons/border-48.png"
  },
  "applications": {
    "gecko": {
      "id": "clichosting@gmail.com",
      "strict_min_version": "40.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.*/*"
      ],
      "js": [
        "adwords-blocker.js"
      ]
    }
  ]
}