I just installed Avast free and have MBAM premium. I know nothing about setting these up right, but why am I getting all these blank page tabs open every time I open a link or webpage? Has something to do with Avast as it just started. And am I supposed to leave my Avast in passive mode because of my MBAM?

Did you remove any (pre)installed av before installing avast ?
Did you set a exclusion for avast in MBam and vica versa ?

I did remove McAfee but the Avast installed fine with the passive mode with MBAM left on. I read many posts that they could run together. I assume I am to leave passive mode on Avast, but don’t know anything about doing exclusions! Just puzzled why all the blank page tabs keep appearing along the top…just started after Avast free.

Regarding Avast & MBAM, see: https://forums.malwarebytes.com/topic/200324-exclusions-for-avast-users/