# Substack Notification Filter

> 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.

Canonical page: [https://chrome-stats.com/d/substack-notification-filter](https://chrome-stats.com/d/substack-notification-filter)

## Overview

- **ID:** `substack-notification-filter`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Mythraps
- **Category:** feeds-news-blogging,social-communication
- **Daily users:** 1
- **Version:** 0.3.3
- **Last updated:** 2025-12-11
- **First published:** 2025-12-08
- **Size:** 37 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/substack-notification-filter/)

## Description

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

<strong>Smart Filtering:</strong>
  - 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)

<strong>Easy to Use:</strong>
  - 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)

<strong>Privacy First:</strong>
  - 100% local processing (no cloud, no tracking)
  - Zero data collection
  - Open source and auditable
  - No ads, completely free

<strong>Mobile Support:</strong>
  - Works on Firefox Android (unique feature!)
  - Same powerful filtering on the go

### How It Works
<ol><li>Install the extension</li><li>Visit <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/84e5d72ac874db29147d7cbf8f350a4e14edc238eda614819cc9f56138243d4b/https%3A//substack.com/activity" rel="nofollow">https://substack.com/activity</a></li><li>Configure your filters in the extension popup</li><li>Enjoy a cleaner notification feed!</li></ol>
### Perfect For
<ul><li>Substack writers managing active communities</li><li>Readers who want signal, not noise</li><li>Anyone tired of notification spam</li><li>Mobile users on Firefox Android</li></ul>
### Save Time

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

### Support
<ul><li>GitHub: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c11346d4f0c3fdcaa6b0da14bb525f824b2da3bdfef7e8d4642d199dcae4f847/https%3A//github.com/sattarip/substack-filter" rel="nofollow">https://github.com/sattarip/substack-filter</a> (replace with your actual username)</li><li>Issues: Report bugs on GitHub</li><li>Support development: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/e0927c75792b262316633f384390a6aaf7d11caa7ac36f2e75502e86cbf96eaf/https%3A//patreon.com/mythraps" rel="nofollow">https://patreon.com/mythraps</a> (optional)</li></ul>
Categories:
  - ✅ Productivity
  - ✅ Social &amp; Communication

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

License:
  - Select: MIT License

Privacy Policy:
  This extension does not collect, store, or transmit any user data.

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

The extension only accesses:
  - <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/d0bbf8df123bb4af79bb5f9849fdb957c8ae39545f85750532421c24dd30cc7d/http%3A//substack.com/activity" rel="nofollow">substack.com/activity</a> 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
  <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/9e003733e6211dc47c360c2ecba433cb4097e92385ea3f730e5820a798427e46/https%3A//github.com/sattarip/substack-notification-filter" rel="nofollow">https://github.com/sattarip/substack-notification-filter</a>
  (Replace with your actual GitHub URL once you create it)

## Rankings

- #114,592 — Overall
- #74 — notification

## Permissions and access

### Permissions

- `storage`
- `activeTab`

### Host permissions

- `https://*.substack.com/*`

### Content script matches

- `substack.com`
- `*.substack.com`

## Safety

- **Risk impact:** Low risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/substack-notification-filter)