Examine source code of RanGen

{
  "manifest_version": 2,
  "name": "RanGen",
  "version": "0.1.0",
  "description": "Quick and simple random number generator.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "RanGen",
    "default_popup": "popup.html"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{72643a40-5136-4935-84d1-8a5eb158b4f4}",
      "strict_min_version": "94.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}