Examine source code of Search weibo

{
  "manifest_version": 2,
  "name": "Search weibo",
  "version": "0.1",
  "description": "A menu option to search selected text on weibo, by yun.",
  "icons": {
    "16": "icons/weibo.png"
  },
  "permissions": [
    "contextMenus"
  ],
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "weibo",
      "search_url": "https://s.weibo.com/weibo/{searchTerms}",
      "keyword": "wb"
    }
  }
}