Examine source code of Subreddit Jumper Search

{
  "manifest_version": 2,
  "name": "Subreddit Jumper Search",
  "description": "Adds a shortcut ('r') to instant jump to a subreddit",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "55.0",
      "id": "{0bb7d448-6d24-4a43-a60f-b9e25f11e585}"
    }
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Subreddit",
      "search_url": "https://www.reddit.com/r/{searchTerms}",
      "keyword": "r",
      "favicon_url": "https://www.redditstatic.com/desktop2x/img/favicon/favicon-32x32.png",
      "is_default": false,
      "encoding": "UTF-8"
    }
  }
}