Examine source code of Productive Medium

{
  "name": "Productive-Medium",
  "description": "Removes the parts of medium that distract you from writing.  Opinionated and effective.",
  "icons": {},
  "version": "0.12resigned1",
  "permissions": [
    "tabs",
    "http://*.medium.com/*",
    "https://*.medium.com/*"
  ],
  "browser_action": {
    "default_title": "Removes distracting medium feeds"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.medium.com/",
        "*://www.medium.com/*",
        "*://www.medium.com/s/*",
        "*://medium.com/",
        "*://medium.com/s/*"
      ],
      "css": [
        "style.css"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{06979c19-4fd7-4af2-b842-4e7cccac948b}"
    }
  }
}