Examine source code of TTRPG Dice Roller

{
  "manifest_version": 2,
  "name": "D20 Dice Roller",
  "version": "1.0.2",
  "description": "Roll TTRPG dice directly from your browser.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d65ffd84-c5a6-4dfd-9dc9-63cc1419b966}"
    }
  }
}