# DataLayer Lens

> A powerful, beautiful tool for monitoring GTM dataLayer events in real-time

Canonical page: [https://chrome-stats.com/d/datalayer-lens](https://chrome-stats.com/d/datalayer-lens)

## Overview

- **ID:** `datalayer-lens`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** SizzleBits
- **Category:** web-development
- **Daily users:** 48
- **Weekly downloads:** 3
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 3.3.3
- **Last updated:** 2026-02-03
- **First published:** 2026-01-22
- **Size:** 208 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/datalayer-lens/)
- **Website:** [https://github.com/sizzlebits/dataLayerLens/issues](https://github.com/sizzlebits/dataLayerLens/issues)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/datalayer-lens/privacy/](https://addons.mozilla.org/firefox/addon/datalayer-lens/privacy/)

## Description

DataLayer Lens

<strong>A clearer way to inspect, debug, and understand your dataLayer.</strong>

DataLayer Lens is a DevTools extension built for people who work with Google Tag Manager, analytics, CRO, and modern web applications. It gives you a reliable, easy-to-read view of <code>dataLayer</code> activity so you can validate events, debug implementations, and understand what’s really happening on the page.

Whether you’re QA’ing a tracking setup, diagnosing missing events, or working through a complex user journey, DataLayer Lens helps you stay focused and in control.

Features

Real-time dataLayer monitoring

View <code>dataLayer</code> events as they happen directly inside DevTools. No page refreshes or console digging required.

Per-domain settings

Configuration is saved per domain, so each site behaves the way you expect when you come back to it.

Event grouping

Related events can be grouped by trigger, making it much easier to follow event sequences and understand intent.

Pagination for large event histories

Work comfortably with high-volume sites by paging through events instead of loading everything at once.

Optional console logging

Send events to the browser console when you want deeper inspection or quick debugging alongside other logs.

Event filtering

Filter events by name using include or exclude modes to reduce noise and focus on the signals that matter.

Copy and export

Copy individual events or export the full event history to JSON for sharing, documentation, or further analysis.

Persist events across navigations

Keep a continuous record of events as you move between pages, even when the <code>dataLayer</code> would normally reset.

Cleane UI designed for daily use

A fast, responsive interface with a dark theme, subtle animations, and syntax highlighting that stays readable during long debugging sessions.

Built for real-world workflows

DataLayer Lens is designed to fit naturally into how GTM specialists, analysts, CRO teams, and developers actually work. It stays lightweight, avoids unnecessary abstraction, and gives you just enough structure to make sense of complex implementations.

Install it once and keep it open while you work. It quickly becomes part of your everyday toolkit.

## Rankings

- #16,461 — Overall
- #42 — x data
- #58 — data
- #75 — event
- #191 — data privacy
- #210 — player

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/datalayer-lens)