Examine source code of DuckDuckGo Safe

{
  "manifest_version": 2,
  "name": "DuckDuckGo Safe",
  "description": "Search DuckDuckGo with strict safe search enabled and no visible option to disable it.",
  "version": "1.0.2",
  "omnibox": {
    "keyword": "ddg"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "65.0"
    }
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "DuckDuckGo Safe",
      "search_url": "https://safe.duckduckgo.com/?q={searchTerms}",
      "suggest_url": "https://safe.duckduckgo.com/ac/?q={searchTerms}&type=list",
      "favicon_url": "https://safe.duckduckgo.com/favicon.ico",
      "is_default": true,
      "encoding": "UTF-8"
    }
  }
}