xp won't remember user I.D

  genus 17:43 20 Jun 2006

I am using xp pro with Mozilla Firefox as my browser.
I use Yahoo.com for my email. Recently it has started to ask me for my I.D as well as my password when trying to access my mail. My other pc using Windows 98 and Mozilla Firefox only asks for my password to log in to Yahoo Mail.

Any help please?

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