Substack Notification Filter

Name: Substack Notification Filter
Author: Mythraps

Filter Substack notifications by keywords, slurs, engagement, and user status. Block spam, toxic content, and low-quality notifications automatically. Works on desktop and Android Firefox. 100% private, no data collection.

Download

Install

Features & Capabilities

Take Control of Your Substack Notifications

Tired of spam, toxic comments, and notification overload on Substack? This extension automatically filters your activity feed so you only see what matters.

Key Features

Smart Filtering:

Block specific keywords and slurs
Pre-populated common slur blocklist (one-click enable)
Set minimum engagement threshold (hide low-quality content)
Show only notifications from people you follow
Whitelist trusted users (never filtered)
Filter by notification type (replies, likes, restacks)

Easy to Use:

Quick setup presets (Mild, Moderate, Strict)
Export/import your settings
Temporary disable (1-hour pause)
Visual indicators showing why items were filtered
Smooth animations
Dark mode support
Keyboard shortcuts (Ctrl+Shift+F, Ctrl+Shift+H)

Privacy First:

100% local processing (no cloud, no tracking)
Zero data collection
Open source and auditable
No ads, completely free

Mobile Support:

Works on Firefox Android (unique feature!)
Same powerful filtering on the go

How It Works

Install the extension
Visit https://substack.com/activity
Configure your filters in the extension popup
Enjoy a cleaner notification feed!

### Perfect For

Substack writers managing active communities
Readers who want signal, not noise
Anyone tired of notification spam
Mobile users on Firefox Android

### Save Time

Average users save 25+ minutes per day on notification moderation. That's 150+ hours per year!

Support

GitHub: https://github.com/sattarip/substack-filter (replace with your actual username)
Issues: Report bugs on GitHub
Support development: https://patreon.com/mythraps (optional)

Categories: - ✅ Productivity - ✅ Social & Communication

Tags: substack, notifications, filter, spam, content moderation, productivity

License:

Select: MIT License

All filtering happens locally in your browser. No analytics, no tracking, no cloud services.

The extension only accesses:

substack.com/activity page (to filter notifications)
Local storage (to save your settings on your device)

Your settings are stored only on your device and are never transmitted anywhere.

Support Website: TODO https://github.com/sattarip/substack-notification-filter (Replace with your actual GitHub URL once you create it)

User Growth & Download Statistics

Add-on

By:

Mythraps

Daily users:

Version:

0.3.3 Last updated: 2025-12-11

Version code:

6093035

Creation date:

2025-12-08

Risk:

Permissions:

Host permissions:

https://*.substack.com/*

Content scripts matches:

substack.com
*.substack.com

Size:

37.37KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-03

Compare stats and ranking:

Ranking

# 135,487 ▲ 848

Other rankings

#140 in notification keyword 12 ▲ 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:

Mythraps

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/substack-notification-filter/

Is Substack Notification Filter 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 Notification Filter 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 Notification Filter 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.
Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****