Examine source code of Fox 3D viewer

{
  "manifest_version": 3,
  "name": "Fox 3D viewer",
  "version": "1.0.3",
  "description": "View a wide range of 3D formats directly in your browser, like 3DM (Rhino 3D), 3DS, 3MF, DAE (COLLADA), DRC, FBX, GCODE, GLB, GLTF, KMZ, LWO, MD2, MPD, NRRD, OBJ (Wavefront), PDB, PLY, STL, USDZ, VOX, VTK, VTP, WRL, XYZ",
  "homepage_url": "https://github.com/gversluis/firefox-fox-3d-viewer",
  "icons": {
    "16": "icons/icon-16.png",
    "19": "icons/icon-19.png",
    "38": "icons/icon-38.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "19": "icons/icon-19.png",
      "38": "icons/icon-38.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Fox 3D viewer"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'; object-src 'none'; frame-src 'self'; script-src 'self' blob: 'wasm-unsafe-eval'; worker-src 'self' blob: 'wasm-unsafe-eval'; img-src 'self' blob: https: filesystem: data:; media-src 'self' blob: https: filesystem:; connect-src blob: https: filesystem:; style-src 'self' blob: 'unsafe-inline' 'unsafe-hashes'; font-src 'self' data:; upgrade-insecure-requests;"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "/viewer/*",
        "/icons/*"
      ]
    }
  ],
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "webNavigation",
    "storage"
  ],
  "host_permissions": [],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "fox-3d-viewer@gversluis.github.io",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "128.0"
    }
  }
}