Examine source code of Highlight Google Ads

{
  "manifest_version": 2,
  "name": "Highlight Google Ads",
  "version": "0.1.1",
  "description": "Changes the style of Google's search ads, making them easier to identify.",
  "icons": {
    "48": "./icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "css": [
        "styles.css"
      ]
    }
  ]
}