Examine source code of Start Dot Duck

{
  "manifest_version": 2,
  "name": "Start Dot Duck",
  "short_name": "sdd",
  "description": "Adds the DuckDuckGo start page (start.duckduckgo.com) as a search engine to avoid that annoying pop-up",
  "version": "1.0",
  "author": "BigDriz",
  "developer": {
    "name": "Andrew Van Schaack",
    "url": "https://github.com/bigdriz15"
  },
  "homepage_url": "https://github.com/bigdriz15/start-dot-duck",
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Start Dot Duck",
      "search_url": "https://start.duckduckgo.com?q={searchTerms}",
      "keyword": "@sdd",
      "favicon_url": "icons/icon.svg",
      "is_default": false,
      "encoding": "UTF-8"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "64": "icons/icon.svg",
    "96": "icons/icon.svg",
    "144": "icons/icon.svg",
    "310": "icons/icon.svg",
    "540": "icons/icon.svg",
    "720": "icons/icon.svg",
    "1500": "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dbd43a76-a75d-4801-ad4e-94ddc1544606}"
    }
  }
}