diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index c0b5b94..fa69947 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -2360,6 +2360,14 @@
     }
   }
 }
+@supports -moz-bool-pref("userChrome.theme.transparent.panel") {
+  panel[type="arrow"] {
+    --panel-background: transparent !important;
+  }
+  panelview {
+    background: color-mix(in srgb, var(--arrowpanel-background) 90%, transparent) !important;
+  }
+}
 /*= Proton Theme Mode ========================================================*/
 @supports -moz-bool-pref("userChrome.theme.proton_chrome") {
   /*= Proton Commons ===========================================================*/
diff --git a/src/theme/_index.scss b/src/theme/_index.scss
index 2441bb3..c77bd34 100644
--- a/src/theme/_index.scss
+++ b/src/theme/_index.scss
@@ -41,6 +41,9 @@
 @include Option("userChrome.theme.transparent.menu") {
   @import "transparent/menu";
 }
+@include Option("userChrome.theme.transparent.panel") {
+  @import "transparent/panel";
+}
 
 /*= Proton Theme Mode ========================================================*/
 @include Option("userChrome.theme.proton_chrome") {
diff --git a/user.js b/user.js
index e59f1d4..91ce2d6 100644
--- a/user.js
+++ b/user.js
@@ -73,6 +73,7 @@ user_pref("userChrome.rounding.square_tab",           false);
 // user_pref("userChrome.theme.monospace",                     true);
 // user_pref("userChrome.theme.transparent.frame",             true);
 // user_pref("userChrome.theme.transparent.menu",              true);
+// user_pref("userChrome.theme.transparent.panel",             true);
 // user_pref("userChrome.theme.non_native_menu",               true); // only for linux
 // user_pref("userChrome.compatibility.os.win11",              true);