firefox: fix rust-simd and option change

4 jobs for master in 1 minute and 6 seconds (queued for 1 second)
Status Job ID Name Coverage
  Package
canceled #8586
PKGBUILD
build_pkgs

00:01:06

 
  Sign
canceled #8587
signature
sign_pkgs

 
  Deploy
canceled #8588
rsync allowed to fail manual
deploy_pkgs

 
  Stable
canceled #8589
rsync allowed to fail manual
move_pkgs_to_stable