diff --git a/src/chrome/browser/browser.css b/src/chrome/browser/browser.css
index b4cfdf9..42da729 100644
--- a/src/chrome/browser/browser.css
+++ b/src/chrome/browser/browser.css
@@ -2573,6 +2573,107 @@ tabpanels {
   padding: 0px 2px 0px 2px !important;
 }
 
+/* ::::: tab sound indicator ::::: */
+
+.tab-icon-sound {
+  margin-inline-start: 2px;
+  margin-inline-end: 2px;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+}
+
+.allTabs-endimage[soundplaying],
+.allTabs-endimage[muted],
+.allTabs-endimage[blocked],
+.tab-icon-sound[soundplaying],
+.tab-icon-sound[muted],
+.tab-icon-sound[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio");
+  filter: url(chrome://browser/skin/filters.svg#fill);
+  fill: currentColor;
+}
+
+.allTabs-endimage[muted],
+.tab-icon-sound[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted");
+}
+
+.allTabs-endimage[blocked],
+.tab-icon-sound[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-blocked");
+}
+
+.tab-icon-sound:-moz-lwtheme-darktext[soundplaying],
+.tab-icon-sound:-moz-lwtheme-darktext[muted],
+.tab-icon-sound:-moz-lwtheme-darktext[blocked] {
+  filter: url(chrome://browser/skin/filters.svg#fill) drop-shadow(1px 1px 1px white);
+}
+
+.tab-icon-sound:-moz-lwtheme-brighttext[soundplaying],
+.tab-icon-sound:-moz-lwtheme-brighttext[muted],
+.tab-icon-sound:-moz-lwtheme-brighttext[blocked] {
+  filter: url(chrome://browser/skin/filters.svg#fill) drop-shadow(1px 1px 1px black);
+}
+
+.tab-icon-sound[soundplaying]:not(:hover),
+.tab-icon-sound[muted]:not(:hover),
+.tab-icon-sound[blocked]:not(:hover) {
+  opacity: .8;
+}
+
+.tab-icon-sound[soundplaying-scheduledremoval]:not([muted]):not(:hover),
+.tab-icon-overlay[soundplaying-scheduledremoval]:not([muted]):not(:hover) {
+  transition: opacity .3s linear var(--soundplaying-removal-delay);
+  opacity: 0;
+}
+
+/* tab icon overlay */
+.tab-icon-overlay {
+  width: 16px;
+  height: 16px;
+  margin-top: -8px;
+  margin-inline-start: -15px;
+  margin-inline-end: -1px;
+  position: relative;
+}
+
+.tab-icon-overlay[soundplaying],
+.tab-icon-overlay[muted]:not([crashed]),
+.tab-icon-overlay[blocked]:not([crashed]) {
+  border-radius: 10px;
+}
+
+.tab-icon-overlay[soundplaying]:hover,
+.tab-icon-overlay[muted]:not([crashed]):hover,
+.tab-icon-overlay[blocked]:not([crashed]):hover {
+  background-color: white;
+}
+
+.tab-icon-overlay[soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio");
+}
+
+.tab-icon-overlay[muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-muted");
+}
+
+.tab-icon-overlay[blocked] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-blocked");
+}
+
+.tab-icon-overlay[soundplaying]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white");
+}
+
+.tab-icon-overlay[muted]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-muted");
+}
+
+.tab-icon-overlay[blocked]:-moz-lwtheme-brighttext:not(:hover) {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-small.svg#tab-audio-white-blocked");
+}
+
 /* ::::: tabbar scroll buttons ::::: */
 
 .tabbrowser-arrowscrollbox > .scrollbutton-up,
diff --git a/src/chrome/browser/filters.svg b/src/chrome/browser/filters.svg
new file mode 100644
index 0000000..8fccb13
--- /dev/null
+++ b/src/chrome/browser/filters.svg
@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<svg xmlns="http://www.w3.org/2000/svg">
+  <filter id="fill">
+    <feComposite in="FillPaint" in2="SourceGraphic" operator="in"/>
+  </filter>
+</svg>
diff --git a/src/chrome/browser/tabbrowser/tab-audio-small.svg b/src/chrome/browser/tabbrowser/tab-audio-small.svg
new file mode 100644
index 0000000..abfe712
--- /dev/null
+++ b/src/chrome/browser/tabbrowser/tab-audio-small.svg
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="16" height="16" viewBox="0 0 16 16">
+  <style>
+    .icon:not(:target) {
+      display: none;
+    }
+
+    .icon {
+      fill: #262626;
+    }
+    .icon > .outline {
+      fill: #fff;
+    }
+
+    .icon.white {
+      fill: #fff;
+    }
+    .icon.white > .outline {
+      fill: #000;
+      fill-opacity: .5;
+    }
+  </style>
+
+  <g id="tab-audio" class="icon">
+    <path class="outline" d="M12.4,3.6l-1-0.6l-0.9,2.5H10V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5H4C2.9,5,2,5.9,2,7v2c0,1.1,0.9,2,2,2h1.6l3.6,3.6 c0.3,0.3,0.9,0.1,0.9-0.4v-3.7h0.5l0.9,2.5l1-0.6C14,11.5,15,9.8,15,8S14,4.5,12.4,3.6z M9,13l-3-3H4c-0.6,0-1-0.4-1-1V7 c0-0.6,0.4-1,1-1h2l3-3V13z M10,9.5v-3c0.8,0,1.5,0.7,1.5,1.5S10.8,9.5,10,9.5z M11.9,11.5l-0.4-0.9C12.4,10,13,9.1,13,8 s-0.6-2-1.4-2.5l0.3-1C13.2,5.2,14,6.5,14,8S13.2,10.8,11.9,11.5z"/>
+    <path d="M4,6C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h2l3,3V3L6,6H4z M10,6.5v3c0.8,0,1.5-0.7,1.5-1.5S10.8,6.5,10,6.5z M11.9,4.5 l-0.4,0.9C12.4,6,13,6.9,13,8s-0.6,2-1.4,2.5l0.4,0.9c1.2-0.7,2.1-2,2.1-3.5S13.2,5.2,11.9,4.5z"/>
+  </g>
+  <g id="tab-audio-muted" class="icon">
+    <path class="outline" d="M5.6,5H4C2.9,5,2,5.9,2,7v2c0,0.7,0.3,1.3,0.9,1.7l-1.8,1.8l2.5,2.5l3-3l2.6,2.6c0.3,0.3,0.9,0.1,0.9-0.4V8.5l3.9-3.9 l-2.5-2.5L10,3.5V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5z"/>
+    <path d="M11.5,3.5L9,5.9V3L6,6H4C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h0.9l-2.5,2.5l1.1,1.1l9-9L11.5,3.5z M9,13V9.7l-1.7,1.7L9,13z"/>
+  </g>
+
+  <g id="tab-audio-white" class="icon white">
+    <path class="outline" d="M12.4,3.6l-1-0.6l-0.9,2.5H10V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5H4C2.9,5,2,5.9,2,7v2c0,1.1,0.9,2,2,2h1.6l3.6,3.6 c0.3,0.3,0.9,0.1,0.9-0.4v-3.7h0.5l0.9,2.5l1-0.6C14,11.5,15,9.8,15,8S14,4.5,12.4,3.6z M9,13l-3-3H4c-0.6,0-1-0.4-1-1V7 c0-0.6,0.4-1,1-1h2l3-3V13z M10,9.5v-3c0.8,0,1.5,0.7,1.5,1.5S10.8,9.5,10,9.5z M11.9,11.5l-0.4-0.9C12.4,10,13,9.1,13,8 s-0.6-2-1.4-2.5l0.3-1C13.2,5.2,14,6.5,14,8S13.2,10.8,11.9,11.5z"/>
+    <path d="M4,6C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h2l3,3V3L6,6H4z M10,6.5v3c0.8,0,1.5-0.7,1.5-1.5S10.8,6.5,10,6.5z M11.9,4.5 l-0.4,0.9C12.4,6,13,6.9,13,8s-0.6,2-1.4,2.5l0.4,0.9c1.2-0.7,2.1-2,2.1-3.5S13.2,5.2,11.9,4.5z"/>
+  </g>
+  <g id="tab-audio-white-muted" class="icon white">
+    <path class="outline" d="M5.6,5H4C2.9,5,2,5.9,2,7v2c0,0.7,0.3,1.3,0.9,1.7l-1.8,1.8l2.5,2.5l3-3l2.6,2.6c0.3,0.3,0.9,0.1,0.9-0.4V8.5l3.9-3.9 l-2.5-2.5L10,3.5V1.8c0-0.4-0.5-0.7-0.9-0.4L5.6,5z"/>
+    <path d="M11.5,3.5L9,5.9V3L6,6H4C3.4,6,3,6.4,3,7v2c0,0.6,0.4,1,1,1h0.9l-2.5,2.5l1.1,1.1l9-9L11.5,3.5z M9,13V9.7l-1.7,1.7L9,13z"/>
+  </g>
+
+  <g id="tab-audio-blocked" class="icon">
+    <path class="outline" d="M8,1.2C4.3,1.2,1.2,4.3,1.2,8s3.1,6.8,6.8,6.8s6.8-3.1,6.8-6.8S11.7,1.2,8,1.2z M8,11.9
+      c-2.1,0-3.9-1.7-3.9-3.9c0-2.1,1.7-3.9,3.9-3.9s3.9,1.7,3.9,3.9C11.9,10.1,10.1,11.9,8,11.9z M11.1,7.3L6.6,4.6L5.4,3.9v1.4v5.3V12
+      l1.2-0.7L11,8.6L12.2,8L11.1,7.3z"/>
+    <path d="M8,2C4.7,2,2,4.7,2,8s2.7,6,6,6s6-2.7,6-6S11.3,2,8,2z M8,12.7c-2.6,0-4.7-2.1-4.7-4.7
+      S5.4,3.3,8,3.3s4.7,2.1,4.7,4.7S10.6,12.7,8,12.7z M10.7,8L6.2,5.3v5.4L10.7,8z"/>
+  </g>
+  <g id="tab-audio-white-blocked" class="icon">
+    <path class="outline" d="M8,0c3.3,0,6.4,2.2,7.5,5.3c1.1,3.1,0.1,6.7-2.5,8.9c-2.6,2.1-6.3,2.4-9.2,0.7
+      C1,13.1-0.5,9.8,0.1,6.5C0.9,2.8,4.2,0,8,0z"/>
+    <path d="M8,2C4.7,2,2,4.7,2,8s2.7,6,6,6s6-2.7,6-6S11.3,2,8,2z M8,12.7c-2.6,0-4.7-2.1-4.7-4.7
+      S5.4,3.3,8,3.3s4.7,2.1,4.7,4.7S10.6,12.7,8,12.7z M10.7,8L6.2,5.3v5.4L10.7,8z"/>
+  </g>
+</svg>
diff --git a/src/chrome/browser/tabbrowser/tab-audio.svg b/src/chrome/browser/tabbrowser/tab-audio.svg
new file mode 100644
index 0000000..274e10c
--- /dev/null
+++ b/src/chrome/browser/tabbrowser/tab-audio.svg
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+  <style>
+    path:not(:target) {
+      display: none;
+    }
+  </style>
+
+  <path id="tab-audio" d="M4,5C2.9,5,2,5.9,2,7v2c0,1.1,0.9,2,2,2h1.2L9,14V2L5.2,5H4z M11,8c0-0.6-0.4-1-1-1v2C10.6,9,11,8.6,11,8z M13,8 c0-1.4-1-2.6-2.3-2.9L10.4,6C11.3,6.2,12,7,12,8s-0.7,1.8-1.6,2l0.4,0.9C12,10.6,13,9.4,13,8z M11.4,3.2l-0.4,0.9 C12.8,4.6,14,6.2,14,8s-1.2,3.4-2.9,3.8l0.4,0.9C13.5,12.2,15,10.3,15,8S13.5,3.8,11.4,3.2z"/>
+
+  <path id="tab-audio-muted" d="M12.5,3.4L9,6.3V2L5.2,5H4C2.9,5,2,5.9,2,7v2c0,0.9,0.6,1.6,1.4,1.9l-1.9,1.5l1,1.2l11-9L12.5,3.4z M9,14v-4l-2.5,2L9,14z"/>
+
+  <path id="tab-audio-blocked" d="M8,0C3.6,0,0,3.6,0,8s3.6,8,8,8s8-3.6,8-8S12.4,0,8,0z M5.6,11.6l6-3.6l-6-3.6V11.6z M8,14.2
+  c-3.4,0-6.2-2.8-6.2-6.2S4.6,1.8,8,1.8s6.2,2.8,6.2,6.2S11.4,14.2,8,14.2z"/>
+</svg>