Examine source code of Googling shortcuts

{
  "manifest_version": 3,
  "minimum_chrome_version": "88",
  "name": "Google Search Shortcuts",
  "description": "Adds keyboard shortcuts to Google search results",
  "version": "3.0.1",
  "icons": {
    "16": "img/icon16.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "64": "img/icon64.png",
    "128": "img/icon128.png"
  },
  "author": "Francisco Altimari <francisco@altimari.nl",
  "homepage_url": "https://github.com/churris-x/google-search-shortcuts",
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "service_worker": "js/background.js",
    "scripts": [
      "js/background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "francisco@altimari.nl"
    }
  },
  "permissions": [
    "notifications",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/*"
      ],
      "js": [
        "js/utils.js",
        "js/shortcuts.js"
      ],
      "css": [
        "css/highlight.css"
      ]
    }
  ]
}