diff --git a/userChrome.css b/userChrome.css
index ea3d01a..3d04ea0 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -671,7 +671,8 @@
     }
 
     /*- Toolbar --------------------------------------------------------------*/
-    #navigator-toolbox {
+    :root:not(:-moz-lwtheme) #navigator-toolbox,
+    :root[lwt-default-theme-in-dark-mode] #navigator-toolbox {
       appearance: auto !important;
     }