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I ran a Canvas fingerprinting browser test and noticed that I am susceptible to Canvas fingerprinting in Firefox 66. This was a surprise to me, as I had read several announcements declaring that Firefox 58 introduced a prompt when sites attempt to read Canvas Fingerprint data. Has this feature been removed?

How can I change Firefox settings so that it will prompt me to request permission before providing read access to the HTML Canvas?

I see several Firefox addons which can impede Canvas fingerprinting. CanvasBlocker alters the Javascript APIs. Canvas Defender adds some random noise to prevent an enduring fingerprint. However, I would rather change a permission to prevent code from being run, rather than installing an addon which will run additional code.

This Superuser answer describes how Firefox stores site-specific Canvas permissions settings, and may be helpful. However, I am interested in changing the permission for all websites.

sondra.kinsey
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1 Answers1

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The setting you are looking for is privacy.resistFingerprinting.

Though be aware that setting this to true also renders some websites that heavily utilize the canvas defunct (in my experience this mainly affects browser games, but YMMV). If you run into any trouble with this, CanvasBlocker set to block mode "fake" is probably your best bet.

Entropy0
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