Is signTextJS plus safe?

Low risk

signTextJS plus exposes a native signing API to every web page and auto-signs requests from file:// pages.

The extension injects signText and signTextAsync into window.crypto on all pages and frames, letting pages send supplied text, hostname, protocol, and options to the extension. The background script passes those requests to the local signtextjs_plus native host; for file:// pages that request the auto option, it signs with the first certificate without opening the certificate chooser.

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

JaSPv0.9.6Firefox Add-ons
17Risk
Who publishes it

JaSP - 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
JaSP

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 0.9.6. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Talk to a program installed on your computer, outside the browser's sandbox

    nativeMessaging

  • Store data in your browser

    storage

Where it sends data

Destinations our analysis observed signTextJS plus 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.

  • signtextjs_plus native host

    signTextJS plus sends data to signtextjs_plus native host. Named as a recipient in this extension's own analysis.

Updated 30 September 2026amo-698172