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

https://github.com/jnbr/void-packages firefox_68
https://github.com/void-linux/void-packages/pull/12989

[NOMERGE] firefox: update to 68.0.
Some of the language packs were removed because they aren't provided by upstream for this version.

depends on #12988 

A patch file from https://github.com/void-linux/void-packages/pull/12989.patch is attached