Who is Web Page Annotator for?

Web Page Annotator is an open-source project built for firefox users who need web page annotation tools.

Does Web Page Annotator have a free plan?

Yes — Web Page Annotator is open source under the Open Source license and free to use.

What platforms does Web Page Annotator run on?

Web Page Annotator runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Is Web Page Annotator still active?

Unverified. Web Page Annotator 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 Web Page Annotator?

Similar projects tracked by PulseGate include Web page annotator, Annotator, and Webpage SideNotes.

Who develops Web Page Annotator?

Web Page Annotator is developed by Thomas McKinstry.

How long has Web Page Annotator been around?

Web Page Annotator first shipped in 2025.

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Web Page Annotator

Name: Web Page Annotator
Author: Thomas McKinstry

github.comInfrastructure

Web Page Annotator is an open-source Firefox extension that lets users add annotations or notes to web pages. It is intended for users who want to mark up and reference online content within their browser.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit github.com

Overview

3 features

In the Browser DevTools & extensions space, Web Page Annotator takes a focused approach. It focuses on annotating and organizing notes directly on web pages without switching to another application. Web Page Annotator is an open-source project aimed at firefox users who need web page annotation tools. The project is open source (Open Source). It runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Thomas McKinstry builds and maintains Web Page Annotator, and it first shipped in 2025. Among its 3 catalogued features are page annotations, browser integration, and firefox support.

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

Page annotations
Browser integration
Firefox support

Built with & integrations

Connectors

github

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

Indexed13 Sep · 23:43 UTC
Web Page Annotator verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Web Page Annotator

What is Web Page Annotator?: Web Page Annotator focuses on annotating and organizing notes directly on web pages without switching to another application. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Web Page Annotator for?: Web Page Annotator is an open-source project built for firefox users who need web page annotation tools.
Does Web Page Annotator have a free plan?: Yes — Web Page Annotator is open source under the Open Source license and free to use.
What platforms does Web Page Annotator run on?: Web Page Annotator runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is Web Page Annotator still active?: Unverified. Web Page Annotator 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 Web Page Annotator?: Similar projects tracked by PulseGate include Web page annotator, Annotator, and Webpage SideNotes.Web page annotator Annotator Webpage SideNotes
Who develops Web Page Annotator?: Web Page Annotator is developed by Thomas McKinstry.
How long has Web Page Annotator been around?: Web Page Annotator first shipped in 2025.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: Firefox users who need web page annotation tools
Model: Open source
Solves: Annotating and organizing notes directly on web pages without switching to another application.

Registered as

Firefox Add-ons: web-annotator

Developer

Thomas McKinstry

Index record

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

Identity audit (13)

Slug: web-page-annotator-github-com
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. 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: 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: 13 Sep 2026
Canonical URL: https://github.com/thomasmckinstry/Web-Page-Annotator-for-Firefox

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