Near-real-time monitoring
New request destinations appear while the current page and its frames are active.
Open-source browser extension
Site Domains Explorer
Monitor the first-party and third-party hostnames a website uses in near real time, then search, inspect, categorize, and copy the results locally.
Current-site view
A focused view of every detected hostname
Results update while the page is active, with separate controls for first-party, third-party, and complete hostname lists.
Version 1.0.1
Built for repeated inspection, not one-off reports
Network events, Resource Timing, page attributes, stylesheet references, and packaged dynamic-request observers work together for broad hostname discovery.
Clear categorization
Hostnames are separated into the site's own infrastructure and third-party services.
Purpose-built copying
Copy first-party, third-party, or complete hostname lists with one command.
Searchable site history
Expand any visited site, inspect categorized domains, and copy its lists separately.
Local control
Collection requires explicit consent and saved history can be deleted at any time.
Seven languages
English, Spanish, German, Brazilian Portuguese, Russian, Ukrainian, and French.
Cross-browser Manifest V3
Dedicated release packages for each browser engine
A shared WebExtensions codebase uses the background environment supported by each browser, while store packages retain platform-specific manifests.
Chromium
Chrome and Chromium-based browsers version 102 or later.
site-domains-explorer-1.0.1.zip
Firefox
Firefox desktop 140 or later and Firefox for Android 142 or later.
site-domains-explorer-firefox-1.0.1.zip
Developers can build both validated packages with ./build.ps1. The
repository root also contains a cross-browser manifest for direct source testing.
Privacy documentation
Review exactly what the extension processes
The policy explains stored data, permissions, retention, user controls, security, and the open-source commitment.