Examine source code of Free Range

{
  "manifest_version": 2,
  "name": "Free Range",
  "version": "1.1resigned1",
  "description": "Remove 'sticky' header and footer from medium.com and hackernoon.com",
  "icons": {
    "48": "icons/freerange48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.medium.com/*",
        "*://*.hackernoon.com/*"
      ],
      "js": [
        "freerange.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8567b0ee-62f2-4648-972a-03210fcaf4cd}"
    }
  }
}