Mossy Note focuses on blocking unwanted content on web pages while browsing Firefox. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Mossy Note?

Mossy Note is a consumer product built for firefox users who want to block web content.

Yes — Mossy Note is free to use.

What platforms does Mossy Note run on?

Mossy Note runs on the web, embeddable surfaces, and Android.

Is Mossy Note still maintained?

Unverified. Mossy Note has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to Mossy Note?

Similar projects tracked by PulseGate include Amber Note, Otr Note, and Harbor Note.

Who develops Mossy Note?

Mossy Note is developed by Picos.

When did Mossy Note launch?

Mossy Note first shipped in 2026.

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Mossy Note

Name: Mossy Note
Author: Picos

mozilla.orgBrowser DevTools & extensions

Mossy Note is a Firefox browser extension that blocks content on web pages. It is available for Firefox on desktop and Android, with optional access to data across websites and no developer-declared data collection.

FreeWebEmbeddableAndroid

Visit mozilla.org

Overview

4 features

Mossy Note sits in PulseGate's Browser DevTools & extensions category. It focuses on blocking unwanted content on web pages while browsing Firefox. Mossy Note is a consumer product aimed at firefox users who want to block web content. Mossy Note costs nothing to use. Mossy Note is available on the web, embeddable surfaces, and Android.

It is developed by Picos, and it first shipped in 2026. Among its 4 catalogued features are content blocking, website permissions, and firefox for Android. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Content blocking
Website permissions
Firefox for Android
No data collection

Built with & integrations

Runs on

BrowserEmbeddableAndroid

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed13 Sep · 01:46 UTC
Mossy Note verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Mossy Note

What is Mossy Note?: Mossy Note focuses on blocking unwanted content on web pages while browsing Firefox. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Mossy Note?: Mossy Note is a consumer product built for firefox users who want to block web content.
Is Mossy Note free?: Yes — Mossy Note is free to use.
What platforms does Mossy Note run on?: Mossy Note runs on the web, embeddable surfaces, and Android.
Is Mossy Note still maintained?: Unverified. Mossy Note has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to Mossy Note?: Similar projects tracked by PulseGate include Amber Note, Otr Note, and Harbor Note.Amber Note Otr Note Harbor Note
Who develops Mossy Note?: Mossy Note is developed by Picos.
When did Mossy Note launch?: Mossy Note first shipped in 2026.

At a glance

Pricing: Free
Platforms: Web
First seen: 13 Sep 2026
Built for: Firefox users who want to block web content
Model: B2C
Solves: Blocking unwanted content on web pages while browsing Firefox.

Registered as

Firefox Add-ons: mossy-note

Developer

Picos

Index record

Indexed: 13 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 13 Sep 2026

Identity audit (13)

Slug: mossy-note-mozilla-org
Lifecycle state recorded: 13 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 13 Sep 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 13 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/mossy-note

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