Examine source code of SVU average calculator

{
  "description": "Average calculator",
  "manifest_version": 2,
  "name": "SVU Calculator",
  "version": "2.1resigned1",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.svuonline.org/*"
      ],
      "js": [
        "borderify.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{41f18adc-243e-4fb5-82f4-c68340268199}"
    }
  }
}