Examine source code of Search Sogou

{
  "manifest_version": 2,
  "name": "Search Sogou",
  "version": "0.1",
  "description": "A menu option to search selected text on Sogou",
  "icons": {
    "16": "icons/sogou.png"
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "search.js"
    ]
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Sogou",
      "search_url": "https://www.sogou.com/web?query={searchTerms}",
      "keyword": "sg"
    }
  }
}