Examine source code of Domain Collector Nexus

{
  "manifest_version": 2,
  "name": "Domain Collector Nexus",
  "version": "1.3.2",
  "description": "Track per-domain request success/failure by tab",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "downloads",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Domain Collector Nexus",
    "default_icon": {
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "128": "icons/icon-128.png",
    "512": "icons/icon-512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4b4fc39-8ea5-43ea-b063-d9662046c826}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ],
        "optional": []
      }
    }
  }
}