Examine source code of xmlExtract2

{
  "description": "Create for Marcelo Benavides marbentor@gmail.com  for get data  from XML page and print reports ",
  "manifest_version": 2,
  "name": "xmlExtract",
  "version": "3.0",
  "homepage_url": "http://marbentor.com.co",
  "icons": {
    "48": "icons/ico48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/ico32.png",
    "theme_icons": [
      {
        "light": "icons/ico32.png",
        "dark": "icons/icol32.png",
        "size": 32
      }
    ],
    "default_title": "Extract",
    "default_popup": "popup/click.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{338f0c1d-c30e-4a93-ab61-121879130a5c}"
    }
  }
}