Examine source code of Medium Unlimited Access

{
  "manifest_version": 2,
  "name": "Medium Cleaner",
  "version": "0.1",
  "description": "Access all blogs of medium without any cost :)",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "declarativeContent",
    "cookies",
    "https://*/",
    "http://*/"
  ],
  "icons": {
    "16": "font.png",
    "48": "font.png",
    "128": "font.png"
  }
}