Examine source code of ShrekDark

{
  "name": "ShrekDark",
  "description": "Shrek's custom extension. Everything that should already be in the game... and more",
  "version": "3.8",
  "author": "I am Shrek",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [
        "https://*.drednot.io/*"
      ],
      "css": [
        "extrastyle.css"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ShrekDark_kapixar@30gmail.com"
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "https://drednot.io/"
  ],
  "options_ui": {
    "page": "popup/options.html",
    "open_in_tab": true
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "/img/icon16.png",
      "32": "/img/icon32.png",
      "48": "/img/icon48.png",
      "128": "/img/icon128.png"
    }
  },
  "icons": {
    "16": "/img/icon16.png",
    "32": "/img/icon32.png",
    "48": "/img/icon48.png",
    "128": "/img/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "shrekPack.zip",
        "https://api.npoint.io/*",
        "/huge_signs/mosaic.png"
      ],
      "matches": [
        "https://*.drednot.io/*"
      ]
    }
  ]
}