Examine source code of ZZUP Downloader

{
  "manifest_version": 2,
  "name": "ZZUP Gallery Downloader",
  "version": "1.0",
  "description": "Download full‑res ZZUP images into a gallery‑named subfolder",
  "permissions": [
    "downloads",
    "https://zzup.com/content/*",
    "https://zzup.com/viewimage/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://zzup.com/content/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{23cbe35d-9986-4db3-b32f-3746a5b560ba}"
    }
  }
}