--- a/browser/modules/webrtcUI.jsm
+++ b/browser/modules/webrtcUI.jsm
@@ -47,16 +47,21 @@ this.webrtcUI = {
 
     let mm = Cc["@mozilla.org/globalmessagemanager;1"]
                .getService(Ci.nsIMessageListenerManager);
     mm.removeMessageListener("rtcpeer:Request", this);
     mm.removeMessageListener("rtcpeer:CancelRequest", this);
     mm.removeMessageListener("webrtc:Request", this);
     mm.removeMessageListener("webrtc:CancelRequest", this);
     mm.removeMessageListener("webrtc:UpdateBrowserIndicators", this);
+
+    if (gIndicatorWindow) {
+      gIndicatorWindow.close();
+      gIndicatorWindow = null;
+    }
   },
 
   processIndicators: new Map(),
 
   get showGlobalIndicator() {
     for (let [, indicators] of this.processIndicators) {
       if (indicators.showGlobalIndicator)
         return true;