Examine source code of Text to Calendar

{
  "manifest_version": 2,
  "name": "Text to Calendar Parser",
  "version": "1.0",
  "description": "Parse event details from text and create calendar events",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "clipboardRead"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fcdc3b8-8610-454a-9863-a4cf5bd27a79}"
    }
  }
}