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

https://github.com/jnbr/void-packages fiefox-dbg
https://github.com/void-linux/void-packages/pull/26663

firefox: fix sandbox for fcntl
fixes #26639 

[ci skip]

A patch file from https://github.com/void-linux/void-packages/pull/26663.patch is attached