Hello and welcome to justanswer. My name is***** will be assisting you today. I am sorry to hear that you are having such trouble. I will try my best to help you.Could you please provide the following details.
Which is the operating system installed in the PC.Is it Windows Vista, Windows 7, windows 8, Windows 10 ?
Which is the web browser are you using to open xfinity email page is it edge, Internet explorer, Mozilla Firefox, Chrome or any other?
Does this issue page not responding issue happens on other web pages too?
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Hey, I like to troubleshoot things like this remotely. When are you available for a remote session?