Examine source code of Nano Weather

{
  "manifest_version": 3,
  "name": "Nano Weather",
  "version": "1.1.3",
  "description": "A minimalist weather extension showing temperature on your toolbar.",
  "browser_specific_settings": {
    "gecko": {
      "id": "simple-weather-pro@your-name.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "geolocation"
  ],
  "host_permissions": [
    "https://api.open-meteo.com/*"
  ],
  "icons": {
    "128": "icon.png"
  },
  "action": {
    "default_title": "Simple Weather",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "weather_map.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}