diff --git a/.local/share/chezmoi/software.yml b/.local/share/chezmoi/software.yml
index 404c1e89..af061d24 100644
--- a/.local/share/chezmoi/software.yml
+++ b/.local/share/chezmoi/software.yml
@@ -1844,6 +1844,9 @@ softwarePackages:
     choco: firefox
     dnf: firefox
     pacman: firefox
+  firefox:darwin:
+    _when: '! test -d "/Applications/'
+    cask: firefox
   firewall:
     _bin: null
     _desc: This role is intended to be used with the ProfessorManhattan playbook. It integrates tightly with the other roles included with the playbook.