Examine source code of msredirect

{
  "manifest_version": 2,
  "name": "msredirect",
  "version": "1.0",
  "description": "Redirects Microsoft Documentation website to English.",
  "content_scripts": [
    {
      "matches": [
        "*://*.docs.microsoft.com/*"
      ],
      "js": [
        "msredirect.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{69731d8e-b408-4dd6-ac3e-2ad9a7e257e9}"
    }
  }
}