--- a/browser/themes/shared/devedition.inc.css
+++ b/browser/themes/shared/devedition.inc.css
@@ -288,16 +288,40 @@ window:not([chromehidden~="toolbar"]) #u
   background-color: var(--tab-hover-background-color);
 }
 
 .tabbrowser-tab[visuallyselected] {
   color: var(--tab-selection-color) !important; /* Override color: inherit */
   background-color: var(--tab-selection-background-color);
 }
 
+.tab-icon-sound[visuallyselected=true][soundplaying] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-white");
+}
+
+.tab-icon-sound[visuallyselected=true][soundplaying]:hover {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-white-hover");
+}
+
+.tab-icon-sound[visuallyselected=true][soundplaying]:hover:active {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-white-pressed");
+}
+
+.tab-icon-sound[visuallyselected=true][muted] {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted-white");
+}
+
+.tab-icon-sound[visuallyselected=true][muted]:hover {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted-white-hover");
+}
+
+.tab-icon-sound[visuallyselected=true][muted]:hover:active {
+  list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted-white-pressed");
+}
+
 /* Don't need space for the tab curves (66px - 30px) */
 .tabs-newtab-button {
   width: 36px;
 }
 
 .tabs-newtab-button:hover {
   /* Important needed because !important is used in browser.css */
   background-color: var(--tab-hover-background-color) !important;

--- a/browser/themes/shared/tabs.inc.css
+++ b/browser/themes/shared/tabs.inc.css
@@ -171,36 +171,42 @@
 .tab-icon-sound[muted]:hover {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-backgroundTab-muted-hover");
 }
 
 .tab-icon-sound[muted]:hover:active {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-backgroundTab-muted-pressed");
 }
 
+.tab-icon-sound:-moz-lwtheme,
 .tab-icon-sound[visuallyselected=true][soundplaying] {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio");
 }
 
+.tab-icon-sound:hover:-moz-lwtheme,
 .tab-icon-sound[visuallyselected=true][soundplaying]:hover {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-hover");
 }
 
+.tab-icon-sound:hover:active:-moz-lwtheme,
 .tab-icon-sound[visuallyselected=true][soundplaying]:hover:active {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-pressed");
 }
 
+.tab-icon-sound[muted]:-moz-lwtheme,
 .tab-icon-sound[visuallyselected=true][muted] {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted");
 }
 
+.tab-icon-sound[muted]:hover:-moz-lwtheme,
 .tab-icon-sound[visuallyselected=true][muted]:hover {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted-hover");
 }
 
+.tab-icon-sound[muted]:hover:active:-moz-lwtheme,
 .tab-icon-sound[visuallyselected=true][muted]:hover:active {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-muted-pressed");
 }
 
 #TabsToolbar[brighttext] .tab-icon-sound[soundplaying] {
   list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio.svg#tab-audio-white");
 }