Hello, I've had this problem before I believe and I had to change something in about:config to rectify this issue but cannot find it nor know exactly how to search for it. I have two Microsoft Online accounts, Account A and Account B. When I go to a website I am prompted to pick an account and I can see Account A and Account B. I then enter my credentials for Account A and I'm in, great. I then go to another site where I need to use Account B, but I don't have the chance to pick Account A or Account B because I'm presented an error because the new tab is trying to use Account A. How do I stop this?