Examine source code of npm Omnibox

{
  "manifest_version": 3,
  "name": "npm Omnibox",
  "description": "Omnibox for searching npm packages on npmjs.com. Type npmjs + space follow by search terms in address bar and start searching",
  "author": "Mr.Manit Treeprapankit",
  "version": "1.0",
  "icons": {
    "16": "icons/icon-16x16.png",
    "32": "icons/icon-32x32.png",
    "48": "icons/icon-48x48.png",
    "128": "icons/icon-128x128.png"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "npm",
      "search_url": "https://www.npmjs.com/search?q=={searchTerms}",
      "favicon_url": "icons/icon-16x16.png",
      "keyword": "npm",
      "is_default": false
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "npmjs_omnibox@8columns.com"
    }
  }
}