Change design to old version for Facebook™

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Change design to old version for Facebook™",
  "version": "5.1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icon-16.png",
      "48": "icon-48.png"
    },
    "default_popup": "./options.html",
    "default_title": "Change design to old version for Facebook™"
  },
  "content_scripts": [
    {
      "css": [
        "style.css"
      ],
      "matches": [
        "*://*.facebook.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Change Facebook to Old Design (before Sep 2020) by changing your browser's configuration to one not supported by the new Facebook",
  "default_locale": "en",
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.facebook.com/*",
    "tabs",
    "storage"
  ]
}