diff --git a/browser/base/content/tabbrowser.xml b/browser/base/content/tabbrowser.xml
index 0f785f062cb237c282bb7d0b354b98da4aab9794..8c157def7ea1941ea08478caa5e86d053ec3b391 100644
--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -2862,7 +2862,7 @@
             }
 
             // Mute audio immediately to improve perceived speed of tab closure.
-            if (aTab.hasAttribute("soundplaying")) {
+            if (!aAdoptedByTab && aTab.hasAttribute("soundplaying")) {
               // Don't persist the muted state as this wasn't a user action.
               // This lets undo-close-tab return it to an unmuted state.
               aTab.linkedBrowser.mute(true);