I have searched on Google for something like this, but I have found no resolve. When ever I open up Firefox, it opens multiple volume sliders in volume mixer. I have Bitdefender and it isn't picking anything up. Something to note, I was on Google Docs a couple of weeks back and a random pop up with an alarm sound came on. I really don't know if I am infected or not.
EDIT - I also forgot to mention that over time the number of tabs in volume mixer will increase.
Here is what it looks like when you first start up firefox https://imgur.com/a/iQh9W
Edited by GoldenExperience, 20 November 2017 - 02:06 PM.