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?
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.