Examine source code of Wikiwand 2

{
  "manifest_version": 2,
  "name": "Wikiwand 2",
  "version": "1.1",
  "description": "Redirects all requests to wikipedia to wikiwand to improve user experience",
  "icons": {
    "48": "icons/wikiwand48.png",
    "64": "icons/wikiwand64.png",
    "96": "icons/wikiwand96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}