Examine source code of DuckDuckGo (POST)

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.0.0",
  "applications": {
    "gecko": {
      "strict_min_version": "65.0"
    }
  },
  "icons": {
    "64": "icons/ddg.png"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "__MSG_searchEngineName__",
      "search_url": "https://safe.duckduckgo.com/?kg=p&kl=__MSG_searchLanguage__&kp=-2",
      "search_url_post_params": "q={searchTerms}",
      "favicon_url": "https://safe.duckduckgo.com/favicon.ico",
      "is_default": true,
      "encoding": "UTF-8"
    }
  },
  "default_locale": "en"
}