Is Progressive Web Apps for Firefox safe?

Clean risk

Installs supported websites as standalone app-like windows using a custom Firefox runtime.

This extension helps install, manage, and use Progressive Web Apps in Firefox through a companion console tool and modified Firefox runtime. When installing a web app, it sends the current website and manifest URLs to the native messaging host, where the description says they are stored locally. It can access HTTP and HTTPS pages, use native messaging, show notifications, and store extension data.

Filip ŠtamcarFirefox Add-ons
0Risk
Who publishes it

Filip Štamcar - no other listings under this identity, 1 shared hostname

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

Publisher
Filip Štamcar

Shared hosts - 1 hostname

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.

brew.sh
Also called by 3 other listings, including Tagged Photo Exporter, CDA.pl Auto Downloader PRO

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

Publishers can request a review.

Where it sends data

Destinations our analysis observed Progressive Web Apps for Firefox 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.

  • native messaging host

    Progressive Web Apps for Firefox sends data to native messaging host. Named as a recipient by 2 other extensions we have analysed.

Updated 15 October 2026amo-2710717