Examine source code of Wallo

{
  "name": "Wallo",
  "description": "Extensión que permite importar movimientos bancarios a Wallo",
  "permissions": [
    "tabs",
    "cookies",
    "https://*/*",
    "http://*/*"
  ],
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "icons/firefox-ext-button.png",
    "default_title": "Wallo",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/ico48.png"
  },
  "version": "1.1.65",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-5hyLB5tSd5WMGA@jetpack"
    }
  }
}