What is Focus Squirrel?

Focus Squirrel focuses on reducing distraction by blocking access to time-consuming websites. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is Focus Squirrel for?

Focus Squirrel is a consumer product built for firefox users seeking better focus and productivity.

Is Focus Squirrel free?

Yes — Focus Squirrel is free to use.

What platforms does Focus Squirrel run on?

Focus Squirrel runs on the web and embeddable surfaces.

Is Focus Squirrel still maintained?

Unverified. Focus Squirrel 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 Focus Squirrel?

Similar projects tracked by PulseGate include Site Blocker, Focus Scope, and Focus Shield.

Who develops Focus Squirrel?

Focus Squirrel is developed by Hieu Nguyen.

When did Focus Squirrel launch?

Focus Squirrel first shipped in 2022.

Back to the index

Focus Squirrel

Name: Focus Squirrel
Author: Hieu Nguyen

mozilla.orgBrowser DevTools & extensions

Focus Squirrel is a Firefox extension that lets users quickly block and unblock websites. It includes page-level blocking, a management page for blocked sites, and temporary disabling of the blocking function.

FreeWebEmbeddable

Visit mozilla.org

Overview

4 features

Focus Squirrel is a Browser DevTools & extensions project. It focuses on reducing distraction by blocking access to time-consuming websites. It is built as a consumer product for firefox users seeking better focus and productivity. It is available for free. It runs on the web and embeddable surfaces.

Hieu Nguyen builds and maintains Focus Squirrel, and it first shipped in 2022. Key capabilities include block sites on page, manage blocked sites, and temporary disable. The interface is available in 32 languages, including Czech, German, and Greek.

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

Block sites on page
Manage blocked sites
Temporary disable
Plugin action

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed17 Sep · 05:42 UTC
Focus Squirrel - Free Site Blocker verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Focus Squirrel

What is Focus Squirrel?: Focus Squirrel focuses on reducing distraction by blocking access to time-consuming websites. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Focus Squirrel for?: Focus Squirrel is a consumer product built for firefox users seeking better focus and productivity.
Is Focus Squirrel free?: Yes — Focus Squirrel is free to use.
What platforms does Focus Squirrel run on?: Focus Squirrel runs on the web and embeddable surfaces.
Is Focus Squirrel still maintained?: Unverified. Focus Squirrel 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 Focus Squirrel?: Similar projects tracked by PulseGate include Site Blocker, Focus Scope, and Focus Shield.Site Blocker Focus Scope Focus Shield
Who develops Focus Squirrel?: Focus Squirrel is developed by Hieu Nguyen.
When did Focus Squirrel launch?: Focus Squirrel first shipped in 2022.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users seeking better focus and productivity
Model: B2C
Solves: Reducing distraction by blocking access to time-consuming websites.

Registered as

Firefox Add-ons: free-site-blocker

Developer

Hieu Nguyen

Index record

Indexed: 17 Sep 2026
Lifecycle: Alive
Last seen: 17 Sep 2026

Identity audit (13)

Slug: focus-squirrel-free-site-blocker-mozilla-org
Lifecycle state recorded: 17 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 17 Sept 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
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: 17 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/free-site-blocker

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do