Mozilla is testing a new feature in the upcoming version of its Firefox web browser that will grant users the ability to block canvas fingerprinting.
(Canvas fingerprinting is one of a number of browser fingerprinting techniques of tracking online users that allow websites to identify and track visitors using HTML5 canvas element instead of browser cookies or other similar means.)
The permission prompt that Firefox displays reads:
"Will you allow [site] to use your HTML5 canvas image data? This may be used to uniquely identify your computer."
Once you get this message, it's up to you whether you want to allow access to canvas fingerprinting or just block it. You can also check the "always remember my decision" box to remember your choice on future visits as well.
For More:
https://thehackernews.com/2017/10/canvas-browser-fingerprint-blocker.html
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