Examine source code of Altered TCG Builder

{
  "manifest_version": 3,
  "name": "Altered TCG Builder",
  "version": "1.1.6",
  "description": "Import decks from the Altered TCG Builder to the official website",
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "https://*.altered.gg/*"
  ],
  "background": {
    "scripts": [
      "background.bundle.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icon.png",
      "48": "assets/icon.png",
      "128": "assets/icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "altered-tcg-builder@ajordat.com",
      "strict_min_version": "112.0"
    }
  }
}