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Firefox is not recognizing my current phone number

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I'm trying to use an old Apple Powerbook as my 2015 MacBook Pro just died. I use Firefox as my browser on my PowerBook, and it is asking me to enter my old phone number and is not accepting my new phone number.

I'm trying to use an old Apple Powerbook as my 2015 MacBook Pro just died. I use Firefox as my browser on my PowerBook, and it is asking me to enter my old phone number and is not accepting my new phone number.

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