Compare software

JShelterCanvasBlocker
Free

Free and open source under the GPL.

 Free

Free and open source under the MPL.

Browser extension Browser extension
  • Targets fingerprinting APIs specifically instead of blocking scripts wholesale
  • Network boundary shield blocks public pages probing your local network
  • Faking rather than blocking keeps sites working while breaking the fingerprint
  • Very granular per-API and per-site configuration
  • Stronger levels break sites that legitimately use the affected APIs
  • Adding noise can itself make a browser more distinctive in some cases
  • Firefox focused
  • Aggressive settings break image editors, games and captchas
Browser extension Browser extension
Open source Open source
License: GPL-3.0 License: MPL-2.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.