Is ChartFox Browser Extension safe?

Clean risk

ChartFox Browser Extension lets ChartFox pages read responses from non-ChartFox XHR requests.

When you use a ChartFox site, the extension applies a browser rule to XHR requests from chartfox.org to other domains. The rule adds an Access-Control-Allow-Origin header, which lets ChartFox page scripts read responses that the browser would normally block by same-origin policy.

Cobalt Grid Ltdv1.3.1Firefox Add-ons
1Risk
Who publishes it

Cobalt Grid Ltd - 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
Cobalt Grid Ltd

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 1.3.1. 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 chartfox.org

    *://*.chartfox.org/*

  • Read and change your data on every site you visit

    *://*/*

  • Block and redirect the requests your browser makes

    declarativeNetRequest

Where it sends data

Destinations our analysis observed ChartFox Browser Extension 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.

  • chartfox.org

    ChartFox Browser Extension sends data to chartfox.org. No other extension we have analysed sends data here.

Updated 30 September 2026amo-2806718