Here exist some problems on my firefox account and I just feel so confused about this.The confusing situation happened yesterday when I install the firefox app on my desktop,I typed in my login email and clicked the enter but the website said that I have to use my main email address to login,I have another email address so I used another email address,about this email address I don't know whether I have used it to create a firefox account,again,I can't login my account,today I directly use the latter email to log in the firefox website,It told me that this email has't been used.So I want to know why I meet this error,and how to solve it.and when I try to change my password,the password-reset email will be sent to both the two email addresses I refeerd to in this question feedback.