Examine source code of Inriver UI Fixer

{
  "manifest_version": 2,
  "name": "InriverFixer",
  "version": "1.4",
  "description": "Regain screen realestate",
  "icons": {
    "48": "hammer-48.png",
    "96": "hammer-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://portal-prod1a-euw.productmarketingcloud.com/app/environment*",
        "*://portal-prod1a-euw.productmarketingcloud.com/app/Environment*"
      ],
      "css": [
        "inriverFixer.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e185c4ef-ec31-4a17-902f-3c2953f8ad3a}",
      "strict_min_version": "58.0"
    }
  }
}