⚠️Requests 3 sensitive permissions
Description
Enable real-time debugging for GTM Server-Side by automatically injecting the necessary X-Gtm-Server-Preview header into all outgoing requests matching your configured domain pattern. Works directly with Google's Tag Manager API using your browser authentication.
When you click "Generate & Activate", the extension:
- Verifies your Google account permissions and access to your GTM account
- Requests a preview token through GTM's official APIs
- Stores the token locally in your browser
- Injects it into matching requests
Essential Requirements:
- You must be logged into Chrome with the same Google account that has access to the GTM containers you want to debug
- Required permissions to the GTM account/container
- Cookies and site data must be enabled
Key Features:
🔧 Advanced Request Interception
- Works with XMLHttpRequest, fetch API
- Custom domain patterns
- Middleware mode support
📡 sendBeacon Support
- Script injection for beacon
- Real-time monitoring
- Full payload inspection
🎯 Flexible Payload Injection
- 3 injection modes
- Custom variable naming
- Dynamic path configuration
Reviews
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Permissions (9)
Permissions
activeTabℹ Can access the current tab when you click the extension cookiesℹ Can read and modify browser cookies declarativeNetRequestℹ Can block or redirect network requests scriptingℹ Can inject scripts into web pages storageℹ Can store data locally in your browser tabsℹ Can see your open tabs and their URLs webNavigationℹ Can monitor navigation events webRequestℹ Can observe and analyze network traffic webRequestBlockingℹ Can intercept and modify network requests
Details
| Version | 3.0.2 |
| Updated | Jan 19, 2026 |
| Size | 72.55KiB |
| First Seen | Mar 22, 2026 |
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