Skip to content
A Firefox Plugin to protect from being fingerprinted
Branch: master
Clone or download
Latest commit 23509ea Apr 21, 2019
Type Name Latest commit message Commit time
Failed to load latest commit information.
.documentation Spanish translation update Mar 2, 2019
.github Improved issue template Dec 17, 2017
.tools Moved i18n to extension module Apr 9, 2019
.vscode Change "showNotifications" title Apr 21, 2019
_locales Change "showNotifications" title Apr 21, 2019
browserAction Moved i18n to extension module Apr 9, 2019
icons Merge branch 'whitelistedIndicator' Sep 16, 2018
lib Run setting migration only in background script Apr 19, 2019
pageAction Moved i18n to extension module Apr 9, 2019
test data-URL test requires proper mime type in current Firefox Apr 9, 2019
.eslintrc.json Linting Jan 24, 2019
LICENSE.txt Added MPL Jan 16, 2015 Added thank to unbranched Apr 4, 2019
releaseNotes.txt Fixed description for "show notifications" Apr 19, 2019

This add-on allows users to prevent websites from using the some Javascript APIs to fingerprint them. Users can choose to block the APIs entirely on some or all websites (which may break some websites) or just block or fake its fingerprinting-friendly readout API.

IMPORTANT: you should only have ONE addon/setting set that protects an API. Otherwise you could face massive performance issues. (E.g. EclipsedMoon for Palemoon has 'canvas.poison' which is known to cause issues: But setting privacy.resistFingerprinting to true is fine.

More information on fingerprinting can be found at:

The different block modes are:

  • fake: Canvas Blocker's default setting, and my favorite! All websites not on the white list or black list can use the protected APIs. But values obtained by the APIs are altered so that a consistent fingerprinting is not possible
  • ask for permission: If a website is not listed on the white list or black list, the user will be asked if the website should be allowed to use the protected APIs each time they are called.
  • block everything: Ignore all lists and block the protected APIs on all websites.
  • allow only white list: Only websites in the white list are allowed to use the protected APIs.
  • block only black list: Block the protected APIs only for websites on the black list.
  • allow everything: Ignore all lists and allow the protected APIs on all websites.

Protected "fingerprinting" APIs:

  • canvas 2d
  • webGL
  • audio
  • history
  • window (disabled by default)
  • DOMRect
  • navigator (disabled by default)

Special thanks to:

  • spodermenpls for finding all the typos
  • Thorin-Oakenpants for the icon idea
  • anthologist and unbranched for the Italian translation
  • Maleficient for the French translation
  • yfdyh000 for the Chinese translation
  • micrococo for the Spanish translation
  • STim99 for the Russian translation

If you want to support this addon you can donate to the following addresses:

  • bitcoin: 159Y9BLcfHyrp6wj6f3syEuk92xkRVTiie
  • monero: 482QYZaagALWtPmwbptwBaexDYmcVsJrhJp2VVjTgjYA3Kk1YyMdSg9Wz2qz1Gh31E843PFVCDWS4hR4Bjf6ipWuB9iz2cs
You can’t perform that action at this time.