There is a new pull request by sgn against master on the void-packages repository

https://github.com/sgn/void-packages firefox-esr-update
https://github.com/void-linux/void-packages/pull/18111

Firefox esr update
Building for x86_64 in progress, the diff looks fine.

A patch file from https://github.com/void-linux/void-packages/pull/18111.patch is attached