Examine source code of D&D Reference Helper

{
  "manifest_version": 2,
  "name": "D&D Reference Helper",
  "version": "1.0",
  "description": "Quickly reference and navigate D&D Beyond pages for better accessibility.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0b574094-2f6b-4bb4-ad0f-2a41cb52e766}"
    }
  }
}