KJS Email Tracker

Name: KJS Email Tracker
Rating: 5 (1 reviews)
Author: Sumit Sharma

By: Sumit Sharma

Tracks if your emails are opened by injecting a tracking pixel.

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Install

Features & Capabilities

Track whether your emails are opened using a Firefox extension and a Cloudflare Worker backend.

✨ Features 🔍 Automatically inserts a unique invisible tracking pixel in Gmail 🧠 Uses two ID system (system-generated + user-facing ID) for reliability 📦 Cloudflare KV logs open events with timestamps and user agents 🇮🇳 Timestamps shown in IST for relevance 📊 Detailed dashboard showing opens, metadata, and export to CSV 📋 Extension popup shows latest email tracking summary 🧼 Filters out Gmail image proxy prefetch to reduce false positives 🔁 Automatically reinjects removed tracking pixels 🌐 Deployable on any Cloudflare Worker and compatible with modern Firefox 🧱 Tech Stack Firefox WebExtension (JavaScript, Manifest V3) Cloudflare Workers & KV storage HTML/CSS (Dashboard + Popup UI)

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

Version:

1.0 Last updated: 2025-06-25

Version code:

5973946

Creation date:

2025-06-22

Risk:

Permissions:

Host permissions:

https://mail.google.com/*
https://email-tracker-worker.doofenshmirtz17.workers.dev/*

Content scripts matches:

mail.google.com

Size:

16.73KB

Email:

su*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-23

Compare stats and ranking:

Ranking

# 31,620 ▲ 1,459

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Sumit Sharma

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/kjs-email-tracker/

Email:

su*****@gmail.com

Website:

https://github.com/Doofenshmirtz16/Firefox-Mail-Track-Extension/tree/main

User Reviews

Crazy extension

by *****, 2025-06-25

View all user reviews ›

Is KJS Email Tracker Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

KJS Email Tracker requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Request access to the following domains: google.com, workers.dev
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

KJS Email Tracker is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******