diff --git a/browser/themes/osx/preferences/preferences.css b/browser/themes/osx/preferences/preferences.css
index 7391345425f2..b14fcc4eb434 100644
--- a/browser/themes/osx/preferences/preferences.css
+++ b/browser/themes/osx/preferences/preferences.css
@@ -14,7 +14,6 @@
 
 .prefwindow {
   padding: 0;
-  font: -moz-dialog !important;
 }
 
 .prefwindow[type="child"] {