From 03fb19d810ccd28330bbc13eb792c512e4db9ea3 Mon Sep 17 00:00:00 2001
From: YUKI Hiroshi <shimoda@clear-code.com>
Date: Thu, 19 Nov 2015 18:31:16 +0900
Subject: [PATCH] Hide virtual sound indicator for a parent tab when the
 subtree is expanded

---
 content/treestyletab/treestyletab.css | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/content/treestyletab/treestyletab.css b/content/treestyletab/treestyletab.css
index 81c14f54..fcd79661 100644
--- a/content/treestyletab/treestyletab.css
+++ b/content/treestyletab/treestyletab.css
@@ -643,6 +643,13 @@ window[chromehidden~="toolbar"]
 	visibility: collapse;
 }
 
+/* hide virtual sound indicator icon in subtree-expanded parent tabs */
+.tabbrowser-tab[soundplaying="true"]:not([treestyletab-really-sound-playing="true"]):not([treestyletab-subtree-collapsed="true"])
+  :-moz-any(.tab-icon-sound,
+            .tab-icon-overlay[soundplaying]) {
+	display: none;
+}
+
 
 /* full tooltip */