Site Domains Explorer

Finds first- and third-party domains used by visited sites and keeps the results locally on your device.

Site Domains Explorer shows in near real time which hostnames a website uses while it loads. It combines browser network events, a packaged network API observer, resource timing, and page resource attributes to find first-party subdomains and third-party services such as APIs, CDNs, scripts, images, fonts, frames, WebSockets, and trackers. Results are organized by visited site and stored only in the local Chrome profile. Open popup and history views update automatically as new hostnames are observed. The popup shows the current site's domains and can copy own, third-party, or all domains. The all-sites page provides searchable history, expandable domain groups, per-site copy controls, and deletion with confirmation. Automatic collection is disabled until the user accepts a clear first-run disclosure. It can be disabled later from Privacy and data collection. The extension has no analytics, advertising, account system, remote code, or external data server. The extension is fully open source under the MIT License. Its complete production source and build script are published at https://github.com/communism420/Site-Domains-Explorer. Supported interface languages: English, Spanish, German, Portuguese (Brazil), Russian, Ukrainian, and French. What's new in 1.0.1 Added Firefox support, making Site Domains Explorer compatible with both Firefox and Chromium-based browsers. Core functionality and local data handling remain unchanged.