Firefox browser isn't a email program.

thanks,i always had Firefox appearing when first logging in and i went from their to the other apps located on the top on left on the screen,now all the screen is empty(Blank)previous assistance you gave ,gave me my email account for a short time,could you please do something again---------thank you Mark

You should take it to a computer shop to diagnosis the problem as Firefox browser by itself doesn't do email as that is a online email that does that or Thunderbird.

francisagar1, who is your ISP? What you see on your screen is only what you see on your screen - there is no relation to software and place on your screen.