Guisebox: User-Agent SwitcherBrowser extension for Firefox and Opera · published by Zydeno

Terms of Use

Publisher: Zydeno · Effective 19 October 2026 · Contact: [email protected]

The extension

Guisebox: User-Agent Switcher ("Guisebox") is a browser extension published by Zydeno. It lets you choose which browser and device the websites you pick are told you are using, for testing and for compatibility.

Licence to use

You may install and use Guisebox on any number of your own browsers. This version is free of charge. You may not resell Guisebox or publish modified copies under the Guisebox name.

Your responsibility

Use Guisebox lawfully and in line with the terms of the websites you visit. Some sites check the browser for sign-in, security or video playback and may stop working when they see another browser; Guisebox shows a warning before it dresses every site, and you can take every guise off at once. Guisebox is not a privacy or anonymity tool and does not hide who you are.

No warranty

Guisebox is provided "as is", without warranty of any kind. Zydeno is not liable for any damage or loss arising from its use, to the extent permitted by law.

Privacy

Guisebox keeps its data only in your browser and sends nothing to Zydeno or anyone else. See the Privacy Policy.

Trademarks

Browser names inside the built-in User-Agent strings are technical data that websites expect; they belong to their owners. Guisebox is not affiliated with any browser maker.

Changes

These terms may be updated with a new version of the extension; the current version is always published at this address.

Contact

Zydeno — [email protected]