Is windmill safe?

Low risk

Windmill base64-encodes the user's proxy account password into a request header sent to a remote-configured server every 5 minutes.

Windmill is a proxy extension that stores the user's proxy account credentials and uses them to authenticate outbound proxy connections. On login and on a recurring 5-minute ping cycle, it sends the account password base64-encoded (not encrypted) in a custom 'user-device' header to a URL supplied by the vendor's remote configuration, rather than a fixed, verifiable endpoint. Base64 is reversible, so the password is recoverable by anyone who can read that header.

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

windmillvpnv3.88Firefox Add-ons
21Risk
Who publishes it

windmillvpn - 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
windmillvpn

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 3.88. 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

    *://*/*

  • Route all of your browsing through a server of its choosing

    proxy

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

    tabs

  • Show you desktop notifications

    notifications

  • 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 windmill 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.

  • Windmill's remote-configured server (extConfig.homeLinks)

    windmill sends data to Windmill's remote-configured server (extConfig.homeLinks). Named as a recipient in this extension's own analysis.

Updated 22 October 2026amo-2631045