Gmail username recovery is one of those processes that almost all Gmail users encounter at least once. This is usually the case when they have not used their Gmail account for a long time. Another reason why Gmail users forgot their username is when they have kept themselves signed in to Gmail for a long time that they do not know their account credentials anymore when they are asked to sign in through another computer or mobile phone.
I have forgotten my password, but my browser remembers it
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Forgot your password
Web Applications Stack Exchange is a question and answer site for power users of web applications. It only takes a minute to sign up. I have forgotten the password or username for my Google account, or I'm unable to access my account for other reasons. If your browser remembers your password that is, the password field is automatically populated when you log in to your Google account, and you're able to log in , you should be able to retrieve your password through your browser's password manager. In order to recover your Google username using this form, you must already have specified a recovery email address or recovery phone number. If you haven't specified any recovery information, you may still be able to find your username if you have fairly recently accessed your email account through a browser.