Examine source code of OGame Enhancements

{
  "manifest_version": 2,
  "name": "OGame Enhancements",
  "version": "1.3",
  "description": "Provides various visual improvements to the OGame UI, including de-emphasizing premium dark matter features.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.ogame.gameforge.com/game/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{30ffddca-f0d1-4d29-acd3-c20ab4f9cba0}"
    }
  }
}