Examine source code of amz-ref-remover

{
  "manifest_version": 2,
  "name": "Amazon Ref Remover",
  "version": "1.2",
  "description": "Removes 'ref' parameter from Amazon links (.de, .com, .co.uk)",
  "icons": {
    "128": "icons/ref_logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.de/*",
        "*://*.amazon.com/*",
        "*://*.amazon.co.uk/*"
      ],
      "js": [
        "refremover.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d45762ed-0b0a-4404-ab1e-b3d85fe0944b}"
    }
  }
}