Install the Extension

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)

1. Visit the Web Store listing for Sygnal Devmode.
2. Click Add to Chrome and accept the requested permissions (storage, declarativeNetRequest, scripting).
3. Once installed, pin the extension so the toolbar icon is always visible.
4. Navigate to a site that contains Devmode-enabled scripts and open the popup to verify the group list loads.

Load Unpacked (Development Builds)

Use this flow if you are testing a beta or working from source.

1. Clone or download the devmode repository.
2. Open chrome://extensions, enable Developer mode, and press Load unpacked.
3. Select the devmode folder. Chrome will register the Manifest V3 service worker.
4. After making changes, click Reload on the extension card to pick up new code.

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

1. Open any page that includes annotated scripts (from local development or staging).
2. Click the Devmode icon.
3. 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 ?