Examine source code of MangaPark Auto Image Fixer

{
  "manifest_version": 3,
  "name": "MangaPark Image Server Switcher",
  "version": "4.0.0",
  "description": "Automatically switches MangaPark image servers when images fail to load.",
  "browser_specific_settings": {
    "gecko": {
      "id": "mangapark-image-server-switcher@addon",
      "strict_min_version": "58.0"
    },
    "gecko_android": {
      "strict_min_version": "58.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://mangapark.com/*",
        "*://www.mangapark.com/*",
        "*://mangapark.net/*",
        "*://www.mangapark.net/*",
        "*://mangapark.org/*",
        "*://www.mangapark.org/*",
        "*://mangapark.me/*",
        "*://www.mangapark.me/*",
        "*://mangapark.io/*",
        "*://www.mangapark.io/*",
        "*://mangapark.to/*",
        "*://www.mangapark.to/*",
        "*://comicpark.org/*",
        "*://www.comicpark.org/*",
        "*://comicpark.to/*",
        "*://www.comicpark.to/*",
        "*://readpark.org/*",
        "*://www.readpark.org/*",
        "*://readpark.net/*",
        "*://www.readpark.net/*",
        "*://parkmanga.com/*",
        "*://www.parkmanga.com/*",
        "*://parkmanga.net/*",
        "*://www.parkmanga.net/*",
        "*://parkmanga.org/*",
        "*://www.parkmanga.org/*",
        "*://mpark.to/*",
        "*://www.mpark.to/*",
        "*://*.mpqom.org/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}