Examine source code of Remove Medium Header

{
  "manifest_version": 2,
  "name": "Remove Medium Header",
  "version": "1.1resigned1",
  "description": "Allows on-click removal of fixed header and footer on Medium and HackerNoon articles.",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.hackernoon.com/*",
        "*://*.medium.com/*"
      ],
      "js": [
        "remo.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c3de306-cc43-4724-a45d-7feb9b06f88f}"
    }
  }
}