Is Live editor for CSS, Less & Sass - Magic CSS safe?

Medium risk

Magic CSS fetches Sass compiler JavaScript from cdnjs and injects it into the active tab in Chromium browsers.

When Sass editing is used outside Firefox or Opera and Sass is not already loaded, the extension downloads sass.sync.min.js from cdnjs. Its background script then runs the downloaded code in the active tab across all frames, allowing that remote script to read the page URL and DOM content in that tab.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

webextensions.orgv8.10.2Firefox Add-ons
42Risk
Who publishes it

webextensions.org - no other listings under this identity, 9 shared hostnames

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
webextensions.org

Shared hosts - 9 hostnames

Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.

nodesource.com
Also called by 2 other listings, including Magic CSS
ostechnix.com
Also called by 2 other listings, including Magic CSS
testpilot.firefox.com
Also called by 2 other listings, including Magic CSS
webextensions.org
Also called by 4 other listings, including Magic CSS, Close Tab by Double Right Click
accounts-static.cdn.mozilla.net
Also called by 5 other listings, including NordVPN, NordVPN - a VPN proxy extension for Firefox
api.accounts.firefox.com
Also called by 5 other listings, including NordVPN, NordVPN - a VPN proxy extension for Firefox
content.cdn.mozilla.net
Also called by 5 other listings, including NordVPN, NordVPN - a VPN proxy extension for Firefox
oauth.accounts.firefox.com
Also called by 6 other listings, including NordVPN
profile.accounts.firefox.com
Also called by 6 other listings, including NordVPN - a VPN proxy extension for Firefox

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

What it can do

Permissions this extension asks for, as declared in version 8.10.2. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Read and change your data on every site you visit

    <all_urls>

  • Act on the current tab, but only after you click the extension

    activeTab

  • Store data in your browser

    storage

  • Store an unlimited amount of data in your browser

    unlimitedStorage

  • See every page you navigate to, as you navigate to it

    webNavigation

Where it sends data

Destinations our analysis observed Live editor for CSS, Less & Sass - Magic CSS contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • cdnjs.cloudflare.comwidely used

    Live editor for CSS, Less & Sass - Magic CSS sends data to cdnjs.cloudflare.com. A widely used service: 50 other extensions we have analysed send data here.

Updated 30 September 2026amo-807942