Examine source code of smtshowID

{
  "manifest_version": 2,
  "name": "smtshowID",
  "version": "1.1resigned1",
  "description": "Show the item id ,seller id and catalog id for result page in aliexpress site.",
  "icons": {
    "48": "icons/smtidicon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.aliexpress.com/*"
      ],
      "js": [
        "smtshowid.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e3cfa183-b67a-4f6a-ab55-7d21f875bcf6}"
    }
  }
}