Examine source code of Better Google Search

{
  "manifest_version": 2,
  "name": "Better Google Search",
  "description": "Fixes annoying things about Google Search.",
  "version": "1.4",
  "author": "Sin Jeong-hun",
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "https://www.google.com/search?*",
    "https://www.google.co.uk/search?*",
    "https://www.google.co.jp/search?*",
    "https://www.google.fr/search?*",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search?*",
        "https://www.google.co.uk/search?*",
        "https://www.google.co.jp/search?*",
        "https://www.google.fr/search?*"
      ],
      "js": [
        "sjhUtilities.js",
        "search.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "settings.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "better@googlesearch"
    }
  }
}