Examine source code of eTools.ch Metasearch

{
  "manifest_version": 2,
  "name": "eTools.ch Metasearch",
  "version": "0.1",
  "description": "Adds to browser metasearch eTools.",
  "icons": {
    "64": "icons/icon.png"
  },
  "permissions": [
    "search",
    "https://*.etools.ch/*"
  ],
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "eTools.ch Metasearch",
      "search_url": "https://www.etools.ch/searchSubmit.do?country=web&language=all&query={searchTerms}",
      "favicon_url": "https://www.etools.ch/favicon.ico",
      "is_default": true
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.etools.ch/*"
      ],
      "css": [
        "custom_style.css"
      ]
    }
  ]
}