Examine source code of Llamada Web

{
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "/img/icon.png",
    "default_popup": "popup.html",
    "default_title": "Llamada Web"
  },
  "commands": {
    "make_call": {
      "description": "Realice una llamada desde un número seleccionado en una página web",
      "suggested_key": {
        "default": "Ctrl+Shift+L",
        "mac": "MacCtrl+Shift+L"
      }
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "thirdParty/jquery.min.js",
        "js/selection.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "description": "Extensión para Mozilla Firefox de Duocom para hacer llamadas web",
  "icons": {
    "16": "/img/icon16.png",
    "48": "/img/icon48.png",
    "128": "/img/icon128.png"
  },
  "manifest_version": 2,
  "name": "Llamada Web",
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "<all_urls>",
    "notifications"
  ],
  "version": "1.0.4.2resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e284128e-d613-4a32-a24b-1c8f5b0a09e1}"
    }
  }
}