Examine source code of Prevent BBC redirect

{
  "manifest_version": 2,
  "name": "Prevent BBC redirect",
  "version": "1.1",
  "description": "Prevent bbc.co.uk redirecting to bbc.com",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.bbc.co.uk/*"
      ],
      "js": [
        "index.js"
      ],
      "run_at": "document_start"
    }
  ]
}