Is StyleGuard Pro safe?

Low risk

StyleGuard Pro rewrites the Content-Security-Policy on every page it loads to allow scripts from saas.styleguard.com.

On every http(s) page load the extension edits the page's security policy headers so code from the vendor's host can run. When you start proofing, it loads vendor-hosted scripts and HTML into the page, and it sends your user ID, email and name to the vendor's menu endpoint. A content script on all pages also accepts window messages that can open tabs or change stored login state.

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

Lingofyv5.2.1.39Firefox Add-ons
21Risk
Who publishes it

Lingofy - no other listings under this identity

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

Publisher
Lingofy

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 5.2.1.39. 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

    http://*/* and 1 more

  • Read and change your data on every secure site you visit

    https://*/*

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

    activeTab

  • Add items to the right-click menu

    contextMenus

  • See the address and title of every tab you have open

    tabs

  • Store data in your browser

    storage

  • Watch every request your browser makes

    webRequest

  • Watch, block and rewrite every request your browser makes

    webRequestBlocking

  • See, disable and uninstall your other extensions, including your security ones

    management

Where it sends data

Destinations our analysis observed StyleGuard Pro 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.

  • saas.styleguard.com

    StyleGuard Pro sends data to saas.styleguard.com. No other extension we have analysed sends data here.

Updated 15 October 2026amo-675125