Examine source code of nofbclid

{
  "manifest_version": 2,
  "name": "nofbclid",
  "version": "1.4",
  "description": "Strips social media tracking params from url requests. Currently removes facebook's fbclid and instgrams igshid",
  "icons": {
    "48": "icons/logo-48.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "nofbclid.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "nofbclid@nboughton.uk"
    }
  }
}