Examine source code of DredArt

{
  "name": "DredArt",
  "description": "Painting tool for drednot.io game. Paint any image as pixel art using Holo!",
  "version": "2.0",
  "author": "Kapixar, I am Shrek",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "{73ac3705-8062-4ca0-a63d-9d8319e0fbce}",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://drednot.io/*",
        "https://test.drednot.io/*"
      ],
      "css": [
        "startup.css"
      ],
      "js": [
        "startup.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "scripting"
  ],
  "action": {
    "default_title": "Open DredArt"
  },
  "icons": {
    "16": "img/icons/icon16.png",
    "32": "img/icons/icon32.png",
    "48": "img/icons/icon48.png",
    "64": "img/icons/icon64.png",
    "128": "img/icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "public/index.html",
        "startup.css",
        "scanner.js",
        "img/hatch.png",
        "img/tiles_subworld.png",
        "img/banners/settings_banner.png",
        "img/banners/guide_banner.png",
        "img/banners/mosaic_banner.png",
        "img/banners/painter.png",
        "img/banners/designer.png",
        "img/chat_share.png",
        "img/chat_desc.png",
        "img/chat_halt.png",
        "img/legacy_bg.png",
        "img/bp_bg.png",
        "img/setup_blank.png",
        "img/setup_color.png"
      ],
      "matches": [
        "https://drednot.io/*",
        "https://test.drednot.io/*"
      ]
    }
  ],
  "host_permissions": [
    "https://*.drednot.io/*"
  ]
}