Examine source code of Search ieee

{
  "manifest_version": 2,
  "name": "Search ieee",
  "version": "0.1",
  "description": "A menu option to search selected text on ieee, by yun.",
  "icons": {
    "16": "icons/ieee.png"
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "search.js"
    ]
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "ieee",
      "search_url": "https://ieeexplore.ieee.org/search/searchresult.jsp?newsearch=true&queryText={searchTerms}",
      "keyword": "ieee"
    }
  }
}