Resist Fingerprinting

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When Resist Fingerprinting settings are enabled in Firefox Advanced Preferences (the Configuration Editor about:config page), it can help prevent websites from uniquely identifying you by limiting the information they can gather about your device. While this may be ideal for those prioritizing maximum privacy, it can cause some websites to function improperly. For most users, Mozilla recommends Fingerprinting Protection mode in Firefox Settings for Enhanced Tracking Protection, which blocks invasive tracking methods while maintaining compatibility with most websites.

Add-ons can enable Resist Fingerprinting in Advanced Preferences, which means it might be active without you explicitly enabling it. You can manage the privacy.resistFingerprinting settings in the about:config page.

How to tell if you have Resist Fingerprinting enabled, and if so, disable it

Warning: These instructions are for experienced Firefox users. Changing settings in the Configuration Editor (about:config) can have serious effects on your browser’s stability, security and performance.
Only proceed if you are comfortable with advanced settings and understand the potential impacts.
To disable Resist Fingerprinting:

  1. Type about:config in the address bar and press EnterReturn.
    A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
  2. In the search bar at the top, search for privacy.resistFingerprinting.
  3. A number of preferences will appear but see if either privacy.resistFingerprinting or privacy.resistFingerprinting.pbMode have a value of true.
  4. To tell if an extension is controlling this preference, you can click toggle the value back to false and restart your browser. After restarting, visit about:config again, and see if the value has been returned to true.

If it has been, you will need to determine which of your extensions is controlling the preference and disable or remove them. One way to do this is to disable the installed extensions one by one, and restart the browser, seeing if the preference is changed upon restarting Firefox. Please be aware that, in rare cases, multiple extensions might be setting the preference.

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