Examine source code of Google Reverse Image

{
  "manifest_version": 3,
  "name": "Google Reverse Image Search",
  "version": "1.0.0",
  "description": "Right-click on any image to search for it on Google Images.",
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "google-reverse-image-search@example.com"
    }
  }
}