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

https://github.com/jdnumm/void-packages firefox-esr-91.7.0
https://github.com/void-linux/void-packages/pull/36084

Firefox esr 91.7.0
Testing the changes:

    I tested the changes in this PR: extensively (x86_64-glibc)

Local build testing:

    I built this PR for x86_64-glibc, x86_64-musl and aarch64

[skip CI]

A patch file from https://github.com/void-linux/void-packages/pull/36084.patch is attached