When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
https://www.mozilla.org/security/advisories/mfsa2020-39/
https://www.mozilla.org/security/advisories/mfsa2020-36/
https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html