When I try to login in to my gmail account with Firefox which I have used for years, Google now requires me to add a new email address which I do not want to do; please see the screenshot attached. If I use Google's Chrome browser, this does not happen, so I have to use Chrome which I don't like as its interface is not user friendly, has poor formatting and massive advertising. So I can use Chrome but not Firefox which is unfair practice by Google. Does anyone know how I can clean out whatever Google has placed on my PC?