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

https://github.com/zdtcd/void-packages firefox
https://github.com/void-linux/void-packages/pull/14220

[DO NOT MERGE] firefox: update to 69.0.
[skip ci]

Tested with:
- x86_64

There're build error with:
- x86_64-musl

A patch file from https://github.com/void-linux/void-packages/pull/14220.patch is attached