Examine source code of Simplify Gmx.net

{
  "manifest_version": 2,
  "name": "Simplify Gmx.net",
  "version": "1.1.2",
  "description": "Reduces content of Gmx.net to show only the e-mail login form.\n\n Is this your main entry point to E-Mails every day? Are you annoyed of all the unnecessary ads and headlines? Then just simlpy hide them with this addon!",
  "icons": {
    "48": "icons/gmx_icon_48.png",
    "96": "icons/gmx_icon_96.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://*.gmx.net/*",
        "*://*.gmx.at/*",
        "*://*.gmx.ch/*"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "simplify_gmxnet.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{553b56da-ef88-4113-aa50-6b63c1387c50}"
    }
  }
}