There's a merged pull request on the void-packages repository

firefox esr
https://github.com/void-linux/void-packages/pull/14229

Description:
Built for:
- [x] x86_64 from x86_64 bootstrap - TESTED
- [x] x86_64-musl from x86_64-musl bootstrap - TESTED
- [x] i686 from i686 bootstrap - BUILT and smoke TESTED.
    - Setting search engine seems broken, the search engine in address bar survives one restart,
    but it's reset to Google on the second restart, the default search engine in setting,
    and search bar. and in homepage doesn't survive the restart.
    Reproducible with Firefox 69.0
    - add-on works fine
- [ ] i686 from x86_64 bootstrap - IN PROGRESS
    - ~tool-chain crashed~ I forget to remove `-march=native` in my configuration
    - depends on #14401 
- [x] aarch64-musl from x86_64-musl bootstrap - smoke TESTED
- [x] ppc64le-musl from x86_64-musl bootstrap