Examine source code of EasyPrint

{
  "manifest_version": 3,
  "name": "EasyPrint",
  "version": "13.0",
  "author": "Ondrej Bartas <ondrej.bartas@prusa3d.cz>",
  "homepage_url": "https://www.printables.com/slice",
  "description": "Enable to access physical printers",
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "permissions": [
    "runtime"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "easyprint-dev@yourdomain.com",
      "strict_min_version": "112.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://slicer.prusa3d.com/*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  }
}