diff --git a/scripts/Windows/Software/Firefox/Manage.ps1 b/scripts/Windows/Software/Firefox/Manage.ps1
index d3d0cca2..0c9fb74e 100644
--- a/scripts/Windows/Software/Firefox/Manage.ps1
+++ b/scripts/Windows/Software/Firefox/Manage.ps1
@@ -34,7 +34,7 @@ Start-SoftwareInstaller @PSBoundParameters `
         );
 
         foreach ($extension in $extensions) {
-            Set-DefaultAppAssociation -Identifier $extensions -ProgId "${appName}HTML$progIdSuffix" -ApplicationName $appName;
+            Set-DefaultAppAssociation -Identifier $extension -ProgId "${appName}HTML$progIdSuffix" -ApplicationName $appName;
         }
 
         foreach ($scheme in $schemes) {