That's How It Happened

I'm away skiing near Chamonix for a week. Using a shared computer in the hotel has alerted me to a horrible security flaw in the combination of Firefox and Google. Firefox on this computer is set entirely in French, and Google likes to default to the local language too. This includes the pop-up and the check-box when you signing into your webmail that asks if you would like your details "remembered on this computer"(Mémoriser mes informations sur cet ordinateur). Obviously this is a bad idea on a computer in a hotel lobby. Someone has been suckered though, perhaps because they don't read french. This person's Google login name and password auto-complete, and I can't figure out how to turn it off (in French). I could change their password, read their personal search history, or even post obscenities in their name. I've always been fairly casual about signing in and out, but what with all the information Google store about all their users, this is frankly terrifying.