How to change T-Mobile ID on Firefox Login Page

vayu

    I used T-mobile 5-6 years back for few weeks. since then, it remembers my ID on firefox browser on MAC. I recently moved to T-mobile from AT&T and trying to login. But, My T-Mobile page still thinks that I want to use my old ID and it does not let me enter my new ID. How to fix it?

     

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