diff --git a/modules/programs/firefox.nix b/modules/programs/firefox.nix
index 1db2952c2..6cf15dddc 100644
--- a/modules/programs/firefox.nix
+++ b/modules/programs/firefox.nix
@@ -286,6 +286,7 @@ in
         "${profilesPath}/${profile.path}/extensions" = mkIf (cfg.extensions != []) {
           source = "${extensionsEnvPkg}/share/mozilla/${extensionPath}";
           recursive = true;
+          force = true;
         };
       })
     );