Here are a few pictures of my screen (sorry for the bad quality, sometimes I had to take the picture quickly before it dissapeared. These pics are from today and yesterday!
The one from Malwarebyte was what I got for the third scan.
# AdwCleaner v4.206 - Rapport créé le 14/06/2015 à 20:22:23
# Mis à jour le 01/06/2015 par Xplode
# Base de données : 2015-06-14.1 [Serveur]
# Système d'exploitation : Windows 7 Home Premium Service Pack 1 (x64)
# Nom d'utilisateur : Julie - JULIE-HP
# Exécuté depuis : F:\Mes Documents\Telechargements\adwcleaner_4.206.exe
# Option : Scanner
Hello! I live in Brasil so I just got up and have not used my computer today. Last night though all the symptoms I described were still present (white square on mozilla, takeitcheap ad on chrome, especially when i use netflix).
I forgot to write down that I also have ads that pop up sometimes when I click somewhere on a page. Usually happens when the white box is present, but not always. And I use Adblock which use to work really well but not anymore...