Guisebox : changeur d'agent utilisateur

Guisebox is a user agent switcher for testing sites and for the odd site that refuses your browser. It dresses one site or one tab in another browser or device, while every other site keeps seeing your real browser.

Off until you choose
Guisebox starts switched off and changes nothing after install. Pick a guise for the site you are on, press Apply & reload, and only that site sees it. Sign-ins, bot checks and video players on other sites keep working.

A wardrobe instead of a long list

• Engines in rows (Chromium, Gecko, WebKit) and platforms in columns (Windows, macOS, Linux, phone, tablet), plus a generic crawler, an old desktop browser and a text-only browser
• Version numbers follow the browser you run, so the presets do not go stale
• Your own guises: name, tag code, User-Agent string, navigator.platform, navigator.vendor, mobile flag and Client Hints brands, with a warning when the values contradict each other

Header and scripts in step

• The User-Agent header and navigator.userAgent, platform, vendor, appVersion and userAgentData change together
• Client Hints headers follow the guise where the browser sends them
• Frames from the same site wear the guise; frames from other sites, such as sign-in or payment boxes, are left alone on purpose
• What the site sees compares the header with what page scripts read, row by row, right on your computer

Where and how long

• Tab: one tab until you close it, or for 15 minutes or an hour
• Site: one host, or a host with its subdomains, always or on a timer
• Everywhere: every site except the ones you list, after a clear warning
• The toolbar button shows the tag of the guise this tab wears
• Take it all off with one click or Alt+Shift+U

Rules you can manage
Search, switch rules on and off, edit, delete several at once with Undo, and save everything to a JSON backup you can restore on another computer.

Interface in 16 languages, light and dark themes, full keyboard control. This version is free.

Conçu pour préserver la confidentialité
Works offline in Firefox and Opera. Your data stays in your browser: nothing is sent to Zydeno or anyone else, and there are no analytics.

Permissions
Guisebox asks for access to a site only when you dress that site. It also uses storage for rules and guises, header rules, scripting for the values page scripts read, the active tab, the page menu and alarms for timers.