firefox opens a new sound bar everytime i play an video
so every time i open a new tab and go to youtube or anywhere else with videos, be it facebook or somewhere else it open a new firefox down in the windows volume mixer or whatever its called, and turned up to maximum and blows my ear off. extremly annoying and makes me wanna quit firefox again over chrome.
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This is related to Firefox being a multi-process application. Each process that uses audio gets its own slider in the Volume Mixer. There is work underway to combine them into one slider, perhaps in Firefox 59.
I don't know if there is any way to work around that behavior at the moment. For now, you may need to reduce the volume of the output device (left-most slider in the Volume Mixer) so that even a 100% output Firefox process is capped at a reasonable volume.
this is how it is, and they keep opening new ones and it's really annoying, don't know why they even have it like that
Firefox typically spins up four web content processes, with the potential for one slider for each. (I'm not sure why, but this problem didn't exist in Firefox 54-55, which were the first to routinely use four web content processes.)
If you want to run fewer content processes, then likely you'll have fewer sliders. See: Firefox's performance settings.
I found a different suggested workaround over here, but I haven't tried it myself: