Examine source code of MediumUnlimited

{
  "name": "MediumUnlimited",
  "version": "3.6.2",
  "description": "Read Medium for Free.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "mediumunlimited@itsshivam.com"
    }
  }
}