When trying to search in Yahoo, using Firefox, About:Blank comes up instead in a new tab. I have to hit the X to close the new tab, and then hit enter again and I will then get my search results. I have 2 PCs and a laptop and they ALL are having this problem since the last Firefox update. I have tried ALL of the recommended fixes, I have refreshed firefox, cleared cache and cookies, turned off firewall, antivirus, extensions, etc. I have even tried some of the config recommended changes and NOTHING works. It is definitely a Firefox problem and NOT a yahoo problem because all works fine in Chrome and Edge.