REST API Client Tester by onyxwizard
🚀 A Postman‑like API client that works on Firefox desktop & Android
Available on Firefox for Android™Available on Firefox for Android™
Extension Metadata
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About this extension
🔌 Send HTTP requests directly from your browser. Enter a URL, choose a method (GET, POST, PUT, DELETE, etc.), add custom headers, and include a request body.
✨ View formatted JSON responses with beautiful syntax highlighting. Switch between raw and pretty‑printed views with one click.
🛡️ Your privacy matters. All data stays on your device – no external servers, no tracking, no analytics.
📱 Works everywhere. Fully functional on both Firefox desktop and Android. Perfect for developers testing APIs, debugging endpoints, or exploring web services on the go.
🔮 Coming soon: Save examples, request history, and environment variables.
✨ View formatted JSON responses with beautiful syntax highlighting. Switch between raw and pretty‑printed views with one click.
🛡️ Your privacy matters. All data stays on your device – no external servers, no tracking, no analytics.
📱 Works everywhere. Fully functional on both Firefox desktop and Android. Perfect for developers testing APIs, debugging endpoints, or exploring web services on the go.
🔮 Coming soon: Save examples, request history, and environment variables.
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Permissions and data
Required permissions:
- Access browser tabs
Optional permissions:
- Access your data for all web sites
Required data collection, according to the developer:
- Web site content
More information
- Add-on Links
- Version
- 1.0
- Size
- 44 kB
- Last updated
- 7 days ago (17 Feb 2026)
- Related Categories
- Licence
- MIT Licence
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection