Examine source code of Regex Crossword Reader

{
  "manifest_version": 2,
  "name": "Regex Crossword Reader",
  "version": "1.1",
  "description": "Rotates vertical regexes to be readable",
  "content_scripts": [
    {
      "matches": [
        "*://*.regexcrossword.com/*"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{98aba61b-c6fd-4c54-893f-dda5e266bb6c}"
    }
  }
}