Examine source code of Medium Enabler

{
  "manifest_version": 2,
  "name": "Medium Enabler",
  "version": "1.0",
  "author": "Hosam El Nagar",
  "description": "Enables Medium.com in countries blocking the website like Egypt, more info here: https://qz.com/africa/1017939/",
  "homepage_url": "https://github.com/hosamn/MediumEnabler/",
  "icons": {
    "16": "img/i16.png",
    "20": "img/i20.png",
    "32": "img/i32.png",
    "48": "img/i48.png",
    "64": "img/i64.png",
    "100": "img/i100.png",
    "128": "img/i128.png",
    "256": "img/i256.png",
    "512": "img/i512.png"
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "unlimitedStorage",
    "webNavigation",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://medium.com/*"
      ],
      "js": [
        "linker.js"
      ],
      "run_at": "document_end"
    }
  ]
}