I logged onto a hotel site with Firefox and when I progressed to enter my name, the autofil came up with 4 names that weren't mine. The top two are people I do not know and are not included in my contacts. The bottom two are people I know but are not on my contacts in this format at all. Is this a security concern?

I also failed to get my two factor authentication code when trying to access Mozilla so have had to set up a new account to make this message. I am concerned about security issues relating to both of these.