There is an updated pull request by jdnumm against master on the void-packages repository

https://github.com/jdnumm/void-packages firefox-esr-91.7.1
https://github.com/void-linux/void-packages/pull/36212

Firefox ESR: update to 91.7.1
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`

[ci skip]

A patch file from https://github.com/void-linux/void-packages/pull/36212.patch is attached