Nook is an open-source project built for firefox users and developers interested in browser extensions.

Does Nook have a free plan?

Yes — Nook is open source under the Open Source license and free to use.

What platforms does Nook run on?

Nook runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Is Nook still maintained?

Unverified. Nook 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.

Yes — Nook is open source under the Open Source license.

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Nook

Name: Nook
Author: matlsn

github.comInfrastructure

Nook is an open-source Firefox browser extension distributed through a GitHub repository and Firefox Add-ons. It provides browser-level functionality for users and can be inspected or extended by developers.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit github.com

Overview

3 features

In the Browser DevTools & extensions space, Nook takes a focused approach. It focuses on improving and customizing the Firefox browsing experience with an open-source browser extension. Nook is an open-source project aimed at firefox users and developers interested in browser extensions. The project is open source (Open Source). Nook is available on the web, embeddable surfaces, macOS, Windows, and Linux.

matlsn builds and maintains Nook, and it first shipped in 2019. Key capabilities include firefox extension, browser customization, and open-source code.

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

Firefox extension
Browser customization
Open-source code

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 14:02 UTC
Nook verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Nook

What does Nook do?: Nook focuses on improving and customizing the Firefox browsing experience with an open-source browser extension. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Nook?: Nook is an open-source project built for firefox users and developers interested in browser extensions.
Does Nook have a free plan?: Yes — Nook is open source under the Open Source license and free to use.
What platforms does Nook run on?: Nook runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is Nook still maintained?: Unverified. Nook 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.
Who develops Nook?: Nook is developed by matlsn.
How long has Nook been around?: Nook first shipped in 2019.
Is Nook open source?: Yes — Nook is open source under the Open Source license.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
First seen: 8 Sept 2026
Built for: Firefox users and developers interested in browser extensions
Model: Open source
Solves: Improving and customizing the Firefox browsing experience with an open-source browser extension.

Registered as

Firefox Add-ons: nook

Developer

matlsn

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 8 Sept 2026

Identity audit (13)

Slug: nook-github-com
Lifecycle state recorded: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Written by a language model from the project's public pages.
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: 8 Sept 2026
Canonical URL: https://github.com/matlsn/nook

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