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Change fingerprinting protection

Fingerprinting protection limits what sites can learn about your browser and device. Sval’s defaults make you look like other Sval users and rarely break sites. You can protect more, or less, in Settings.

You want sites to learn as little as possible about your computer, and you accept that some sites might break.

Turn on Strict fingerprinting protection

Section titled “Turn on Strict fingerprinting protection”
  1. Open Settings › Privacy and protection.
  2. Under Fingerprinting, turn on Strict fingerprinting protection.

The line under it says how many strict items are on. The change applies the next time a page loads.

Change one protection

Section titled “Change one protection”
  1. Open Settings › Privacy and protection.
  2. Under Fingerprinting, open Advanced.
  3. Select a group, such as Graphics.
  4. Turn the protection you want on or off.

Each protection says what it hides and what it can break.

Go back to Sval’s defaults

Section titled “Go back to Sval’s defaults”
  1. Open Settings › Privacy and protection.
  2. Under Fingerprinting, select Restore Sval’s defaults.

The message Restored Sval’s defaults. offers Undo.

Details

Section titled “Details”
  • Fingerprinting protection chooses where protection applies: In every window, Only in private windows, or Off. It starts on In every window.
  • Strict fingerprinting protection is off at first. It turns on the strict items, which protect you more and break more sites. When only some are on, it reads Partly on, and turning it on turns on the rest.
  • Tell sites all your languages is off at first, so sites see only your first language.
  • Report the real CPU core count is off at first, so each site sees its own count, between half your cores and all of them.
  • WebRTC (calls in the browser) offers Allow calls, Only through your proxy, and Block. It starts on Allow calls, and sites don’t see your local network address.
  • Mozilla’s compatibility fixes is in Advanced, under Compatibility. See Turn on Mozilla’s compatibility fixes.
  • To turn protection off for one site, use the Privacy and Security button. See Turn off protections for a site.
Section titled “Related pages”

© 2026 Ellm Tree, Inc. Sval is not officially associated with Mozilla or its products. Firefox is a trademark of the Mozilla Foundation in the US and other countries.