Examine source code of Base64 Encoder/Decoder

{
  "manifest_version": 3,
  "name": "Base64 Encoder/Decoder",
  "version": "1.0",
  "icons": {
    "48": "/icons/appicon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "/icons/appicon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d5f503e4-c5b3-4c5d-9d9b-6d5f80c9e7a1}"
    }
  }
}