Why is each open Firefox tab showing up in the Windows volume mixer?

This article applies to Windows only.

If your Windows volume mixer has a slider for each open Firefox tab, this is a bug related to multiprocess (E10s) that will be fixed in Firefox version 76.

In the meantime, in Firefox versions previous to 76, you can set the number of Firefox processes to "1" to resolve the issue:

Setting the number of processes to 1 effectively turns off the multiprocess feature, which may significantly affect Firefox's performance.
  1. Click on the menu button fx57menu to open the menu panel.
  2. Click the menu button New Fx Menu Fx57Menu and select Options.Preferences.
  3. In the General panel, scroll down to Performance.
  4. Remove the check mark next to Use recommended performance settings.
  5. Choose 1 in the drop-down menu for Content process limit.
    set e10s to 1

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