Examine source code of Weather XP

{
  "manifest_version": 2,
  "name": "Weather XP",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{fc6e7295-8708-4ef9-a1f3-b0253b41b195}"
    }
  },
  "description": "A simple browser extension that provides useful and accurate weather information from Open-Meteo, with a Windows XP theme.",
  "homepage_url": "https://github.com/Tahoshee/Weather-XP",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "Weather XP",
    "default_popup": "popup/popup.html"
  }
}