Who is Webextensions for?

Webextensions is an open-source project built for web developers and frontend designers.

What platforms does Webextensions run on?

Webextensions runs on the web and embeddable surfaces.

Is Webextensions still active?

Unverified. Webextensions 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 makes Webextensions?

Webextensions is developed by webextensions.

How long has Webextensions been around?

Webextensions first shipped in 2017.

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Webextensions

Name: Webextensions
Author: webextensions

webextensions.orgBrowser DevTools & extensions

Magic CSS is an open-source Firefox extension for editing CSS, Less, and Sass directly in webpages with live previews. It includes syntax highlighting, autocomplete, Emmet support, selector generation, formatting, minification, linting, and CSS reloading for frontend developers.

Open SourceWebEmbeddable

Visit webextensions.org

Overview

12 features

Webextensions is a Browser DevTools & extensions project. It focuses on editing and testing CSS styles in a live webpage without repeatedly refreshing or rebuilding files. It is built as an open-source project for web developers and frontend designers. Webextensions is open source under the Open Source license. It runs on the web and embeddable surfaces.

webextensions builds and maintains Webextensions, and it first shipped in 2017. Among its 12 catalogued features are Live CSS preview, less and Sass support, and syntax highlighting.

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

Live CSS preview
Less and Sass support
Syntax highlighting
CSS autocomplete
Emmet support
Color picker
CSS formatting
CSS minification
CSS linting
CSS reloading
DOM selector highlighting
Iframe support

Built with & integrations

Hosting

Cloudflare

Runs on

BrowserEmbeddable

Detected from

Cloudflare: cf-ray header · cf-cache-status header

Trust & compliance

License

Open Source

Verified signals

HTTPSOpen SourceFree tierStore-verified publisher

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sep · 18:50 UTC
Live editor for CSS, Less & Sass - Magic CSS verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Webextensions

What does Webextensions do?: Webextensions focuses on editing and testing CSS styles in a live webpage without repeatedly refreshing or rebuilding files. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Webextensions for?: Webextensions is an open-source project built for web developers and frontend designers.
Does Webextensions have a free plan?: Yes — Webextensions is open source under the Open Source license and free to use.
What platforms does Webextensions run on?: Webextensions runs on the web and embeddable surfaces.
Is Webextensions still active?: Unverified. Webextensions 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 makes Webextensions?: Webextensions is developed by webextensions.
How long has Webextensions been around?: Webextensions first shipped in 2017.
Is Webextensions open source?: Yes — Webextensions is open source under the Open Source license.

At a glance

Platforms: Web
Languages: English
License: Open Source
First seen: 8 Sep 2026
Built for: web developers and frontend designers
Model: Open source
Solves: Editing and testing CSS styles in a live webpage without repeatedly refreshing or rebuilding files.

Registered as

Firefox Add-ons: live-editor-for-css-less-sass

Index record

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

Identity audit (13)

Slug: live-editor-for-css-less-sass-magic-css-webextensions-org
Lifecycle state recorded: 8 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 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 from page content.
Last updated: 8 Sep 2026
Canonical URL: https://webextensions.org/

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