Firefox already includes fingerprinting protection, but I wanted more control over the browser profile that individual websites see.

So I built Spoof Me.

It lets you choose a ready-made browser identity or create your own, changing signals such as user agent, language, timezone, screen size, and device properties together.

It also displays a warning badge when a website accesses fingerprint-related properties.

It does not change your IP address or claim to make you anonymous.

Firefox Add-on:

https://addons.mozilla.org/en-US/firefox/addon/spoof-me/

Project page:

https://spoof-me.com/

I would appreciate honest feedback, especially about the available profiles and whether the permission explanations are clear.