diff --git a/userChrome.css b/userChrome.css
index 9cde4b0..24bc048 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -2073,7 +2073,7 @@
           --organizer-pane-field-border-color: color-mix(in srgb, currentColor 41%, transparent);
         }
 
-        @media (prefers-color-scheme: dark) {
+        @media (-moz-toolbar-prefers-color-scheme: dark), (prefers-color-scheme: dark) {
           :root {
             --organizer-color: rgb(251, 251, 254);
             --organizer-deemphasized-color: rgb(191, 191, 201);