Examine source code of Wiki Widener

{
  "manifest_version": 2,
  "name": "Wiki Widener",
  "version": "1.0",
  "description": "makes wikipedia pages full width again",
  "content_scripts": [
    {
      "matches": [
        "*://*.wikipedia.org/*"
      ],
      "js": [
        "Wiki_Widener.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a91af330-6b6b-467b-abf2-d6626d7c8551}"
    }
  }
}