Substack Friend Finder

Name: Substack Friend Finder
Author: Vansh Kumar

By: Vansh Kumar

Find people who share your niche reading interests on Substack

Download

Install

Features & Capabilities

Find people with similar interests based on your Substack newsletter subscriptions.

HOW IT WORKS

Enter your Substack username
The extension scans your subscribed newsletters
For each newsletter, it finds other subscribers and followers
People who appear in multiple of your niche newsletters are surfaced as matches
Matches are ranked by a "nicheness" score - shared small newsletters count more

FEATURES
• Scans ALL your subscribed newsletters
• Finds subscribers AND followers of each newsletter
• Nicheness-weighted scoring (niche newsletters count more)
• Export all matches to CSV for further analysis
• Progress saves automatically - close and reopen anytime
• 100% private - all data stays in your browser

PRIVACY
• No data is ever sent to external servers
• No analytics or tracking
• All data stored locally in your browser
• Open source: https://github.com/vanshkumar/substack-friend-finder

TIPS
• Keep the Substack tab open while scanning
• Scanning takes 8-15 seconds per newsletter (to avoid rate limits)
• Results are cached - rescan anytime to refresh

User Growth & Download Statistics

Add-on

By:

Vansh Kumar

Daily users:

Version:

1.0.0 Last updated: 2026-01-25

Version code:

6128022

Creation date:

2026-01-22

Risk:

Permissions:

storage
activeTab
*://*.substack.com/*

Content scripts matches:

*.substack.com
substack.com

Size:

28.88KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-04

Compare stats and ranking:

Ranking

# 65,893 ▼ 365

Other rankings

#83 in friend keyword 16 ▲ 1#180 in finder keyword 44 ▼ 2

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:

Vansh Kumar

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/substack-friend-finder/

Is Substack Friend Finder 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.

Substack Friend Finder requires very minimum permissions.

Risk impact analysis details

High Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.
Low ******* ****** ** *** ********* ******** ************

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.

Substack Friend Finder may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood analysis details

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