Examine source code of Weather Button

{
  "description": "Weather button displays temperature for selected city. Weather data are get from OpenWeatherMap.org",
  "manifest_version": 2,
  "name": "Weather Button",
  "version": "0.2resigned1",
  "homepage_url": "https://test.com",
  "icons": {
    "32": "icons/icon-32.png"
  },
  "permissions": [
    "http://api.openweathermap.org/*",
    "alarms",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "128": "icons/1.svg"
    },
    "default_title": "Weather Button",
    "browser_style": true,
    "default_popup": "popup/current_weather.html"
  },
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdf6f98e-bb57-45a9-97a0-49a77dbb7922}"
    }
  }
}