Examine source code of idx-search

{
  "manifest_version": 2,
  "name": "idx-search",
  "version": "0.0.4",
  "author": "morketsmerke.org",
  "description": "Search engine for searx.morketsmerke.org/searxng. This search engine is added to preinstalled firefox in immudex (GNU/Linux distribution).",
  "browser_specific_settings": {
    "gecko": {
      "id": "xf0r3m@gmail.com"
    }
  },
  "icons": {
    "64": "icons/logo.png"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "searx.morketsmerke.org",
      "search_url": "https://searx.morketsmerke.org/searxng/?q={searchTerms}&categories=general&language=pl-PL",
      "keyword": "searx",
      "favicon_url": "https://searx.morketsmerke.org/searxng/static/themes/simple/img/favicon.png"
    }
  }
}