Examine source code of HTML5 Universal Speed Hack

{
  "manifest_version": 3,
  "name": "HTML5 Universal Speed Hack",
  "description": "Speeds up or slows down browser games, HTML5 and more...",
  "version": "1.0",
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "html5universalspeedhack@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "162": "icon.png"
  },
  "action": {
    "default_icon": "icon.png",
    "default_title": "HTML5 Universal Speed Hack Free",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "all_frames": true,
      "world": "MAIN",
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "pageScript.js"
      ]
    },
    {
      "all_frames": true,
      "world": "ISOLATED",
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ]
}