Install the Extension
Install Sygnal Devmode from the Chrome Web Store .
Requirements
- Chrome or Chromium-based browser that supports Manifest V3 (Chrome 115+, Edge 115+, Arc, Brave, etc.).
- Permission to install extensions. Enterprise-managed profiles may require admin approval.
Chrome Web Store (Recommended)
https://chromewebstore.google.com/detail/sygnal-devmode/cackddedadgjjhkajcjkkcpeohohcacf
- Visit the Web Store listing for Sygnal Devmode.
- Click Add to Chrome and accept the requested permissions (
storage,declarativeNetRequest,scripting). - Once installed, pin the extension so the toolbar icon is always visible.
- Navigate to a site that contains Devmode-enabled scripts and open the popup to verify the group list loads.
Updating
- Web Store installs update automatically. When a new version ships, Chrome reloads the service worker and the popup with zero downtime.
- Unpacked installs must be reloaded manually after pulling the latest code.
Verifying the Install
- Open any page that includes annotated scripts (from local development or staging).
- Click the Devmode icon.
- You should see the origin listed along with every detected group. If the group list is empty, follow the troubleshooting guide to confirm your markup.
Next: Configure Your Pages ?
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