Examine source code of MineWeather

{
  "name": "MineWeather",
  "description": "Make your new tab page display a crafty scene based on the weather!",
  "version": "0.5.1",
  "manifest_version": 2,
  "default_locale": "en",
  "permissions": [
    "https://api.open-meteo.com/",
    "geolocation",
    "storage",
    "alarms"
  ],
  "chrome_url_overrides": {
    "newtab": "/newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "/newtab.html"
  },
  "background": {
    "scripts": [
      "/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "/popup.html",
    "default_icon": {
      "16": "/icons/icon16.png",
      "24": "/icons/icon24.png",
      "32": "/icons/icon32.png",
      "48": "/icons/icon48.png",
      "128": "/icons/icon128.png"
    }
  },
  "icons": {
    "16": "/icons/icon16.png",
    "24": "/icons/icon24.png",
    "32": "/icons/icon32.png",
    "48": "/icons/icon48.png",
    "128": "/icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{50787c4f-a8d5-4bd9-ad1e-983c2c763d47}"
    }
  }
}