Examine source code of Hackoween Pixel Saver

{
  "manifest_version": 3,
  "name": "Hackoween Pixel Saver",
  "version": "1.0",
  "description": "Applies configurable halloween-themed effects including Syber-Bats, Syber-Drip, Falling-Code code rain, Syber-Glitch, thunder flashes, Abyssal-Fog, click Click-Splat, cursor trails, Syber-Stars, idle Pixel-Saver, and floating Hacko-Jackos. Effects activate on specified sites with smoother fades in Pixel-Saver mode. Modularized and bundled for Firefox compatibility.",
  "author": "You (refactored for modularity and bundling)",
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "vampire-icon-48.webp",
        "vampire-icon-96.webp",
        "vampire-icon-128.webp"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "Hackoween-Pixel-Saver@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "vampire-icon-48.webp",
    "96": "vampire-icon-96.webp",
    "128": "vampire-icon-128.webp"
  }
}