Examine source code of JanitorAI Card Backup

{
  "manifest_version": 3,
  "name": "JanitorAI Card Backup",
  "version": "1.0.4",
  "description": "Export JanitorAI character cards as SillyTavern V2 JSON or PNG",
  "browser_specific_settings": {
    "gecko": {
      "id": "janitorai-card-backup@tydorius.github.io",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "downloads",
    "webRequest",
    "webRequestBlocking",
    "webRequestFilterResponse"
  ],
  "host_permissions": [
    "https://janitorai.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://janitorai.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "JanitorAI Card Backup",
    "default_icon": {
      "16": "icons/icon-16-grayscale.png",
      "48": "icons/icon-48-grayscale.png",
      "128": "icons/icon-128-grayscale.png"
    }
  },
  "icons": {
    "16": "icons/icon-16-grayscale.png",
    "48": "icons/icon-48-grayscale.png",
    "128": "icons/icon-128-grayscale.png"
  }
}