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Tracker Blocker: Stop trackers in emails

Chrome extension by GMass, Inc. · Productivity · Workflow

  • Established publisher
  • Trader

A Chrome extension in Productivity · Workflow with 7 000 users, a small but real audience.

No site access is declared in the manifest, so it cannot read the pages you open on its own.

What the developer says, and 1 screenshot

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
7 000
Rating
3.1 (12 ratings)
Users, last 16 days
unchanged
Rating, last 30 days
Not watched long enough to say
Version
2.0.1
Updated in the store
2025-12-15
Published
2022-01-25
Manifest
V3
Browser access
4 permissions

How it has moved

Users
unchanged since 01.09
7k · 2 readings
  1. 2026-09-017k
  2. 2026-09-167k
Rating
unchanged since 01.09
reviewsrating 3.08 · 2 readings
  1. 2026-09-01reviews12rating3.08
  2. 2026-09-16reviews12rating3.08
Users
unchanged since 01.09
7k · 2 readings
  1. 2026-09-017k
  2. 2026-09-167k
Rating
unchanged since 01.09
reviewsrating 3.08 · 2 readings
  1. 2026-09-01reviews12rating3.08
  2. 2026-09-16reviews12rating3.08

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

No site access is declared in the manifest, so it cannot read the pages you open on its own.

  • Block or redirect requests by rules it declares in advance declarativeNetRequest
  • See which of its blocking rules matched declarativeNetRequestFeedback
  • Show you notifications notifications
Show the remaining 1
  • Store data in your browser storage

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

GMass, Inc. publishes 2 listings we track, 407k users between them. Listed website: gmass.co.

  1. GMass: Powerful mail merge for Gmail GMass, Inc. · Productivity · Communication · published 2015-08-26 400k users ★ 4.8

Like this one

Listings the catalog judges closest in what they say they do.

  1. Email Privacy Protector: Is My Email Tracked? Describes nearly the same job, with an established audience 10k users ★ 4.2
  2. Gmail Tracker Shield Describes nearly the same job, smaller audience 8 users
  3. Email Tracker de MailBolt™ Describes nearly the same job, smaller audience 4 users
  4. Mailshade — Email Tracker Blocker Describes nearly the same job, smaller audience 19 users ★ 5.0
  5. Klopio — Detect & Block Email Tracking in Gmail Describes nearly the same job, smaller audience 10 users ★ 5.0

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.