gtm-ga4-assistant by AxelTM1

Detect and debug Google Tag Manager (GTM) and Google Analytics 4 (GA4) on any website from Firefox. Built for analysts, developers, and QA engineers who need to validate tracking implementations in real time.

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About this extension

GTM & GA4 Assistant is a free, open-source extension that lets you detect, inspect, and debug Google Tag Manager and Google Analytics 4 implementations on any website — without leaving your browser.

Key features:
- Automatic detection of GTM containers and GA4 Measurement IDs on the active page.
- Real-time network hit interception:
- GTM container loads (gtm.js, gtag/js)
- GA4 hits (/g/collect) including event name, measurement ID, client ID, and session ID
- Legacy Universal Analytics hits (/collect)
- Quick popup with a summary for the active tab.
- Dedicated DevTools panel for detailed inspection of each hit and its parameters.
- Automatic cleanup of data on page reload or tab close.
- Privacy: No data is sent to external servers. All processing happens locally in your browser.

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gtm-ga4-assistant by AxelTM1

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