Created attachment 104625 [details] A screenshot demonstrating the bug The volume control on a window playing audio is shown on all windows of that application, even those not playing audio. I suppose this also affects volume control when both the windows are independently playing audio. Steps to reproduce: 1. Open a web browser (window1) 2. Open another window of the web browser (window2) 3. Play some audio in window2 4. See that the volume icon appears in both window1 and window2 Demonstrative image attached.
*** Bug 377787 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 375943 ***