diff --git a/layout/sidebar/audioplayer.scarlet b/layout/sidebar/audioplayer.scarlet
index d408ad92..561f5866 100644
--- a/layout/sidebar/audioplayer.scarlet
+++ b/layout/sidebar/audioplayer.scarlet
@@ -1,3 +1,5 @@
+const audio-player-volume-background = rgba(0, 0, 0, 0.03)
+
 #audio-player
 	vertical
 	default-transition
@@ -136,7 +138,7 @@ mixin volume-slider-hover-thumb
 	-webkit-appearance none
 	width 100%
 	height 6px
-	background rgba(0, 0, 0, 0.03)
+	background audio-player-volume-background
 	outline none !important
 	border none !important
 	box-shadow none !important
@@ -145,6 +147,12 @@ mixin volume-slider-hover-thumb
 	margin 0
 	margin-top 1rem
 
+	::-moz-range-track
+		background transparent
+
+	::-moz-focus-outer
+		border 0
+
 	::-webkit-slider-thumb
 		volume-slider-thumb
 		-webkit-appearance none