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my user name for firefox is a old e-mail - how do i change it

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i changed my e-mail long ago i can not seem to change my user name in fire fox - it is my old e-mail

how do i change the user name?

i changed my e-mail long ago i can not seem to change my user name in fire fox - it is my old e-mail how do i change the user name?

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Change your Email id in edit profile.

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There is no "Firefox username, is this possibly on a website you access?