Examine source code of Text Transformer Plus v2

{
  "manifest_version": 2,
  "name": "Text Transformer Plus v2",
  "version": "1.0",
  "description": "Converts text case and provides additional text transformation tools.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon-48.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c717dec0-8f00-451e-aa4a-9b9e61cc2881}"
    }
  }
}