Debug and test tag management (Google Tag Manager, Adobe Launch / DTM, Tealium) and analytics (Google Analytics, Adobe Analytics) implementations from within Developer Tools.

What is dataslayer?
dataslayer is a Firefox add-on designed to streamline debugging and testing within Developer Tools. It supports a variety of TMS/variables including Google Tag Manager, Adobe Launch, Adobe DTM, Tealium, and custom data layers. It also displays tags from Google Analytics, Adobe Analytics / Omniture SiteCatalyst, and Floodlight. Highly versatile, dataslayer can handle multiple tag management data layers on a single page including embedded iframes.
Users: 2,753 ▲ 25
Rating: 5.00 (7)
Version: 1.3.7 (Last updated: 2020-12-01)
Creation date: 2019-06-05
Weekly download count: 72
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • tabs
  • storage
  • http://*/*
  • https://*/*
  • notifications
  • webNavigation
  • declarativeWebRequest
Size: 435.22K
URLs: Website
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
Want to check extension ranking and stats more quickly for other Firefox add-ons? Install Chrome-Stats extension to view Chrome-Stats data as you browse the Firefox Browser Add-ons.
Chrome-Stats extension

Supported TMS / variables include:

  • Google Tag Manager (dataLayer)
  • Adobe Launch rules and data elements
  • Adobe DTM page load rules
  • Tealium & TagCommander data layers
  • custom data layers (any variable represented as a JavaScript object)

dataslayer also displays tags (including pageviews, variables, and click events) from:

  • Google Analytics (including Universal Analytics / analytics.js, dc.js, and ga.js)
  • Adobe Analytics / Omniture SiteCatalyst
  • Floodlight

dataslayer supports multiple tag management data layers / containers on a single page, including those in embedded iframes.

User reviews

by Peter Lustig, 2024-03-12

by Peter Lustig, 2024-03-12
View all user reviews
Risk impact

dataslayer is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install dataslayer if you trust the publisher.

Risk likelihood

dataslayer has earned a fairly good reputation and likely can be trusted.

Upgrade to see risk analysis details