Examine source code of Simple Base64 Decoder

{
  "manifest_version": 3,
  "name": "Base64 Decoder",
  "version": "1.1",
  "description": "Right-click to decode selected Base64 text and replace it in-place on the webpage.",
  "browser_specific_settings": {
    "gecko": {
      "id": "base64-decoder@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon.svg",
    "32": "icon.svg",
    "48": "icon.svg",
    "128": "icon.svg"
  }
}