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firefox comcast xfinity email problems

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Problem: when I get on my Comcast Xfinity email Firefox automatically shows my wifes login email information, user ID and Password, without me typing in the sign in information. How do I fix this? This is only a problem with Firefox browser. Google and explorer are working correctly. need help to fix

'''Problem:''' when I get on my Comcast Xfinity email Firefox automatically shows my wifes login email information, user ID and Password, without me typing in the sign in information. How do I fix this? This is only a problem with Firefox browser. Google and explorer are working correctly. need help to fix

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Hi Charles, can you check whether it is filling in from Firefox's password manager? See: Edit or delete a login with the Firefox Password Manager.