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

https://github.com/Duncaen/void-packages firefox-100
https://github.com/void-linux/void-packages/pull/36979

Firefox 100
[ci skip]

* [x] x86_64-glibc
* [x] x86_64-musl
* [x] aarch64-musl
* [x] i686

A patch file from https://github.com/void-linux/void-packages/pull/36979.patch is attached