Examine source code of All engine search

{
  "manifest_version": 2,
  "name": "All engine search",
  "version": "0.6",
  "description": "Send search request to all search engines.",
  "homepage_url": "https://github.com/mm3/all-engine-search",
  "applications": {
    "gecko": {
      "strict_min_version": "65.0",
      "id": "{6a6bb6eb-b3a0-4257-8fac-154b6de79898}"
    }
  },
  "icons": {
    "512": "icon.png"
  },
  "permissions": [
    "tabs",
    "search",
    "webNavigation"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "omnibox": {
    "keyword": "."
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "All engine search",
      "keyword": ".",
      "search_url": "https://www.google.com/search?client=firefox-all&q={searchTerms}",
      "suggest_url": "https://www.google.com/complete/search?client=firefox&q={searchTerms}",
      "encoding": "UTF-8",
      "is_default": true
    }
  }
}