Examine source code of GitHub Search (dark mode)

{
  "name": "GitHub Search",
  "description": "Add GitHub to your search engine",
  "version": "0.1",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "superlemon@dev.com",
      "strict_min_version": "64.0"
    }
  },
  "developer": {
    "name": "superlemon",
    "url": "https://github.com/thesuperlemon"
  },
  "icons": {
    "16": "favicon.png"
  },
  "web_accessible_resources": [
    "favicon.png"
  ],
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "GitHub",
      "keyword": "@gh",
      "search_url": "https://github.com/search?q={searchTerms}"
    }
  }
}