Examine source code of PolenCyL

{
  "manifest_version": 2,
  "name": "PolenCyL",
  "version": "1.0.2resigned1",
  "description": "Consulte los valores actuales y su previsiones de distintos tipos de polenes en la comundad autónoma de Castilla y León (España). Fuente de los datos: Junta de Castilla y León.",
  "homepage_url": "http://davidpob99.github.io/webextensions/",
  "icons": {
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "notifications",
    "contextMenus",
    "clipboardWrite",
    "activeTab",
    "storage",
    "http://opendata.jcyl.es/",
    "https://fonts.googleapis.com/*"
  ],
  "browser_action": {
    "default_title": "PolenCyL",
    "default_icon": "icons/icon-64.png",
    "default_popup": "popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24336851-d54c-45b8-ae00-db8d92a35a1c}"
    }
  }
}