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

https://github.com/PaperMountainStudio/void-packages fix-firejail
https://github.com/void-linux/void-packages/pull/23465

firejail: add patch to fix firefox under firejail
Close: #20226

A patch file from https://github.com/void-linux/void-packages/pull/23465.patch is attached