Examine source code of Gmail Helper - Navigate mails using arrow keys

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manifest.json

{
  "manifest_version": 3,
  "name": "Gmail Arrow Key Navigation",
  "version": "1.1.0",
  "description": "Use Left and Right arrow keys to move between newer and older emails in Gmail.",
  "browser_specific_settings": {
    "gecko": {
      "id": "gmail-helper@gaurav.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_title": "Gmail Arrow Key Navigation",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.svg",
    "128": "icon.svg"
  }
}