It's a simply preferences option... Show the notifications everytime that somethig is deleted, but pleas add the option that remove the volume of the notifications.
Sorry, but this is an operating system setting that I can't change. You can probably change it in your OS sound settings somewhere. Firefox doesn't offer an option to make this silent.
It's a simply preferences option... Show the notifications everytime that somethig is deleted, but pleas add the option that remove the volume of the notifications.
Good work man