Examine source code of Google Keep - Full Screen Edit

{
  "name": "Google Keep - Full Screen Edit",
  "short_name": "Google Keep Full Screen",
  "description": "Makes note editing take up the full browser window",
  "homepage_url": "https://github.com/chrisputnam9/chrome-google-keep-full-screen",
  "version": "1.4.1",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "options_page": "src/options/index.html",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://keep.google.com/*"
  ],
  "background": {
    "scripts": [
      "src/service_worker.js"
    ]
  },
  "commands": {
    "toggle-fullscreen": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "Command+Shift+F"
      },
      "description": "Toggle full screen editing"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://keep.google.com/*"
      ],
      "css": [
        "src/content/styles.css"
      ],
      "js": [
        "src/content/script.js",
        "src/shared/options_handler.js"
      ],
      "run_at": "document_start"
    }
  ],
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "{587c2160-ca1c-4546-9bee-853e2b44c13d}"
    }
  }
}