Enabling privacy.resistFingerprinting on Firefox's about:config breaks camera movement.

Description: Enabling privacy.resistFingerprinting on Firefox's about:config breaks camera movement.

• A-Frame Version: 1.2.0
• Platform / Device: Linux Mint 19 x86_64 (Ubuntu Bionic), Firefox 85.0
• Reproducible Code Snippet or URL: https://aframe-camera-movement.glitch.me/

Hello all, I had recently been trying to track down a strange bug that followed me around on my Firefox install for all A-Frame apps I had tried to run in the browser, and had narrowed it down to the privacy.resistFingerprinting setting I had set to "true" in my about:config page. Essentially, when moving the camera (i.e. changing the position, manipulating the rotation with look controls operated normally) with this setting enabled, the camera movement would either be incredibly choppy and sluggish, or the camera would jitter back and forth, occasionally warping somewhere else in the scene. This occurred while using both the default controls (wasd-controls and look-controls) or the movement-controls component in the aframe-extras package, although the ways in which the movement bugged out varied between the two (example linked above).

Not sure what can be done to prevent this (it only seems to affect the camera position from my testing), but I've included some links here that could help lead in the right direction if this is something that can be worked around:

• https://wiki.mozilla.org/Security/Fingerprinting
• https://bugzilla.mozilla.org/show_bug.cgi?id=1217290
• https://bugzilla.mozilla.org/show_bug.cgi?id=1409677
• https://bugzilla.mozilla.org/show_bug.cgi?id=1329996
• https://gitlab.torproject.org/legacy/trac/-/issues/16005

Start with the linked Glitch reproduction in Firefox 85 with privacy.resistFingerprinting enabled, then compare wasd-controls, look-controls, and the aframe-extras movement-controls behavior. Trace how camera position updates differ from rotation; done means camera movement is smooth and does not jitter, lag, or warp in the reported setup.