First thing also is to upgrade from Windows 8.1
MBAM is a companion AV/scanner so you need a fine tune Antivirus which you can choose a lot of them. (Avira, Avast, AVG, or Qihoo)
Extensions are Adguard and HTTPS Everywhere as possible for both browser.
Anyway do you have another computer which is infected or this setup? Since the removal experts will diagnose for any possible Java/Adobe malicious installation.