Examine source code of SucklessMedium

{
  "manifest_version": 2,
  "name": "SucklessMedium",
  "version": "1.0",
  "description": "Make medium blog less miserable to read (it still sucks)",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://medium.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ]
}