If I had to guess, there are various fingerprinting techniques, and some of them use things like drawing on canvases to track you. They are probably referring to that.
this post was submitted on 22 Sep 2025
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Best practice is to have a second browser or profile for specific sites that require you to disable fingerprint protections.
Source: https://github.com/arkenfox/user.js/wiki/3.3-Overrides-%5BTo-RFP-or-Not%5D