For the last 2 weeks, firefox (62.0.2 (64-bit)) is constantly opening tabs with adds. I have completely wiped out and reinstalled firefox. I have run it without any extensions or add-ons except what is there by default when installing firefox. I am pretty certain it's malware. I tried everything described on this page: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware to no avail. I do not browse any dodgy sites that I'm aware of. I do not play games on my computer at all. I ran a lot of different malware cleaners but they either don't find anything or whatever they do find and remove is not making a difference. I have a sophos firewall antivirus and it is not detecting anything either. I started using firefox private window but it will just open a new regular firefox window to display the add. I have installed adblock plus but it does not help. I installed Block Site to at least block the pages when they open up. As I am typing all this, a new window with a blocked add has opened up 4 times. I love firefox and would like to continue using it but I can not work like this and am switching to chrome until a resolution to this issue can be found. Please help!