--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -7104,24 +7104,16 @@
           let browser = this.linkedBrowser;
           let modifiedAttrs = [];
           let hist = Services.telemetry.getHistogramById("TAB_AUDIO_INDICATOR_USED");
 
           if (browser.audioBlocked) {
             this.removeAttribute("blocked");
             modifiedAttrs.push("blocked");
 
-            // We don't want sound icon flickering between "blocked", "none" and
-            // "sound-playing", here adding the "soundplaying" is to keep the
-            // transition smoothly.
-            if (!this.hasAttribute("soundplaying")) {
-              this.setAttribute("soundplaying", true);
-              modifiedAttrs.push("soundplaying");
-            }
-
             browser.resumeMedia();
             hist.add(3 /* unblockByClickingIcon */);
             this.finishMediaBlockTimer();
           } else {
             if (browser.audioMuted) {
               browser.unmute();
               this.removeAttribute("muted");
               BrowserUITelemetry.countTabMutingEvent("unmute", aMuteReason);