Examine source code of Gmail Navigation

{
  "name": "Gmail Navigation",
  "description": "Gmail Navigation helps you quickly jump between emails and attachments within lengthy email threads, eliminating the need for endless scrolling.",
  "version": "1.0",
  "manifest_version": 3,
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gmail-navigation@psyther.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*.svg"
      ],
      "matches": [
        "https://mail.google.com/*"
      ]
    }
  ]
}