^^ Well everything looks clean here.
Disable all of your addons except Adblock Plus, then restart firefox then try if these ads shows or not. Maybe one of your addon is doing it.
BTW, Have you tried using any other browser?
@ OP: Post a screenshot of netstat cmd showing all processes connected to remote server. Maybe we will find the real culprit here.
Yup also tell us which addons are installed in your browser. Also try in other browser if there are ads like this.
BTW, I've doubt on a process. My doubts will be...
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