Unfamiliar account and password appears in the drop-down list of the login box on the page.

[looknice]

As shown in the picture, the account highlighted in red is a stranger account. How did it appear in the password saved in my browser? I asked the people around me, but no one knew me. What other possible risk factors could lead to this situation?

Please help analyze, thank you!

[#2]

@looknice  

Someone just logged in to your computer and enabled synchronization for this profile - rather, it was physical access to the computer.