Examine source code of Request diffing tool

{
  "manifest_version": 3,
  "name": "Request Diff",
  "version": "1.0.1",
  "description": "Records outbound requests per page and flags what changed on repeat visits: new third-party domains, request-count shifts, payload size changes, and new POST endpoints.",
  "author": "you",
  "permissions": [
    "webRequest",
    "webNavigation",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'; connect-src 'self'; frame-ancestors 'none'"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Request Diff",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "request-diff@local.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}