Examine source code of Gearbrain Widget Factory

{
  "name": "Gearbrain Widget Factory",
  "description": "Browser Extension to insert a Gearbrain widget.",
  "version": "3.0.0",
  "manifest_version": 3,
  "author": "Nahgo Technologies",
  "scripts": [
    "gbwf_background.js"
  ],
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "gbwf_popup.html",
    "default_title": "GB Widget Factory"
  },
  "options_ui": {
    "page": "gbwf_options.html",
    "open_in_tab": false,
    "browser_style": false
  },
  "icons": {
    "16": "icons8-toolbox-60.png",
    "32": "icons8-toolbox-60.png",
    "48": "icons8-toolbox-60.png",
    "128": "icons8-toolbox-60.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "*.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "widgetfactory@gearbrain.com"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}