Examine source code of Geometry dash .GMD Loader

{
  "manifest_version": 2,
  "name": "GMD Loader",
  "version": "1",
  "description": "Load custom levels in geometrydash.com",
  "author": "Frigusick",
  "homepage_url": "https://github.com/frigusick/gmd-loader",
  "browser_specific_settings": {
    "gecko": {
      "id": "gmd-loader@frigusick.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "*://geometrydash.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "GMD Loader"
  },
  "web_accessible_resources": [
    "popup.html",
    "popup.js",
    "popup.css"
  ]
}