Margin focuses on capturing and organizing notes from web pages without leaving the browser. It is catalogued under Browser DevTools & extensions on PulseGate.

Margin is an open-source project built for firefox users who take research or browsing notes.

Does Margin have a free plan?

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

Is Margin still active?

Unverified. Margin 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 Margin?

Similar projects tracked by PulseGate include WebMargin, Notes on Sidebar, and Sidebar Note.

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Margin

Name: Margin
Author: Dr

mozilla.orgBrowser DevTools & extensions

Margin is a Firefox sidebar extension for writing and organizing notes while browsing. It lets users clip selected page text, search note titles and bodies, and pin important notes for quick access.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit mozilla.org

Overview

5 features

Margin sits in PulseGate's Browser DevTools & extensions category. It focuses on capturing and organizing notes from web pages without leaving the browser. Margin is an open-source project aimed at firefox users who take research or browsing notes. Margin is open source under the Open Source license. It runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Behind Margin is Dr, and it first shipped in 2026. Among its 5 catalogued features are sidebar notes, text clipping, and note search. The interface is available in 32 languages, including Czech, German, and Greek.

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

Sidebar notes
Text clipping
Note search
Pinned notes
No data collection

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed26 Aug · 15:10 UTC
Margin — Sidebar Notes verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Margin

What is Margin?: Margin focuses on capturing and organizing notes from web pages without leaving the browser. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Margin for?: Margin is an open-source project built for firefox users who take research or browsing notes.
Does Margin have a free plan?: Yes — Margin is open source under the Open Source license and free to use.
What platforms does Margin run on?: Margin runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is Margin still active?: Unverified. Margin 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 Margin?: Similar projects tracked by PulseGate include WebMargin, Notes on Sidebar, and Sidebar Note.WebMargin Notes on Sidebar Sidebar Note
Who develops Margin?: Margin is developed by Dr.
How long has Margin been around?: Margin first shipped in 2026.

At a glance

Pricing: Open Source
Platforms: Web
License: Open Source
First seen: 26 Aug 2026
Built for: Firefox users who take research or browsing notes
Model: Open source
Solves: Capturing and organizing notes from web pages without leaving the browser.

Registered as

Firefox Add-ons: margin-sidebar-notes

Developer

Index record

Indexed: 26 Aug 2026
Lifecycle: Alive
First seen: Aug 2026
Last seen: 26 Aug 2026

Identity audit (13)

Slug: margin-sidebar-notes-mozilla-org
Lifecycle last checked: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 26 Aug 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: 26 Aug 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/margin-sidebar-notes

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