Examine source code of NRDBlocker

{
  "name": "NRDBlocker",
  "description": "Block Newly registered domain (NRD) for prevent threats",
  "version": "1.1",
  "manifest_version": 2,
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_title": "NRDBlocker",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "NRDBlocker@FoxRefire"
    }
  }
}