Since version 118+, Firefox introduced FPP (Finger Printing Protection) which is in short water downed version of RFP (Resist Finger Printing).
FPP is enabled by default from version 119 onwards if you enable ETP (Enhanced Tracking Protection).
FPP randomizes canvas data subtly than RFP, which is why RFP breaks some sites. So, my question is, if we allow canvas data extraction for a broken site will it fallback to FPP's subtle canvas randomization, or allowing it will expose canvas data completely if we have ETP enabled?
Relevant link: https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting
Edit: More info about HTML5 canvas fingerprinting https://webbrowsertools.com/canvas-fingerprint/
I can't answer your question. But I'd like to know what these funny words mean. Can someone explain to me what is html5 canvas data and all the 3 letter words are?
https://coveryourtracks.eff.org/learn https://fingerprint.com/
RFP = I'm assuming he's referring to the about:config setting in Firefox called privacy.resistFingerprinting. This blocks fingerprinting or at least does its best.
OPP = Assuming he's referring to the other about:config setting privacy.resistFingerprinting.autoDeclineNoUserInput... It should work in coordination with the previous setting, overriding the previous restriction if you allow it.
Websites want to keep track of you without relying on cookies so they create an image with text in a canvas element, take the hash value of that and assign that as your unique id that will follow you every where you go on the internet.
I've only worked with canvas but not the security stuff, so I can only answer you partially.
Canvas is an element that you can create with HTML5, and the HTML5 canvas data just means what has been drawn on the canvas.
Now for the FPP, RFP stuff, I'm guessing they are some ways to encrypt the canvas. If the receiving end doesn't decrypt it, the canvas is gonna be random noise.
(This part I'm really unsure about) Due to each client having a different key to encrypt and decrypt, this essentially allows others to track a certain user.
https://webbrowsertools.com/canvas-fingerprint/ has got everything you need to know about html5 canvas.