Examine source code of URL Throttler

{
  "manifest_version": 3,
  "name": "URL Throttler",
  "version": "1.2",
  "description": "Delay network response from user-specified URLs",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "urlthrottler2024@joecoyle.net"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_icon": "icons/icon48.png",
    "default_title": "URL Throttler",
    "default_popup": "popup/index.html"
  }
}