Sygnal Devmode

Toggle DEV/TEST/PROD and rewrite external script src to dev-src/test-src values or redirect via DNR.

Transform how you test and debug web applications across environments. Sygnal Devmode gives developers superpowers: switch between development, testing, and production script sources with a single click—no code changes, no deployments, no hassle. 🚀 What Makes It Special Instant Environment Switching Toggle between DEV, TEST, and PROD modes from your toolbar. Changes apply per-origin, so you can test multiple sites simultaneously without conflicts. Visual Clarity 🔴 Red dot = DEV mode active 🟡 Yellow dot = TEST mode active 🟢 Green dot = PROD mode (default) Page titles show colored dots so you always know which environment you're in Zero Code Changes Just add dev-src and test-src attributes to your script tags once. The extension handles the rest—rewriting URLs on the fly using Chrome's native redirect engine. <script src="https://cdn.example.com/prod/app.js" dev-src="http://localhost:3000/app.js" test-src="https://test-cdn.example.com/app.js"> </script> Smart & Safe - Works with dynamically injected scripts - Per-origin state means production sites stay in PROD while you test elsewhere - Network-level redirects using Manifest V3's Declarative Net Request API 💡 Perfect For - Frontend Developers: Test local changes on production pages instantly - QA Engineers: Switch between staging and production without browser profiles - DevOps Teams: Debug script issues across environments in real-time - Anyone who's tired of: Constant URL swaps, multiple browser profiles, or commenting/uncommenting script tags ⚡ Get Started in Seconds - Install the extension - Add dev-src/test-src attributes to your script tags - Click the extension icon and choose your environment - Reload the page—scripts now load from your selected source - That's it. No configuration files. No build steps. No complexity. 🛡️ Privacy & Security - Stores only URL mappings locally—no data collection - Works entirely on your device - Manifest V3 compliant Stop switching browser profiles. Stop editing production code. Stop wasting time. Start developing smarter with Sygnal Devmode.