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

https://github.com/zdtcd/void-packages firefox-esr
https://github.com/void-linux/void-packages/pull/15753

Firefox esr 68.2.0
Built for:
- [x] x86_64
- [ ] x86_64-musl
- [ ] aarch64-musl
- [ ] i686

Tested with:
- [x] x86_64
- [ ] x86_64-musl

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I'm trying to remove the conflict between firefox and firefox-esr

A patch file from https://github.com/void-linux/void-packages/pull/15753.patch is attached