Autofill Suddenly Stopped Suggesting Log Ins

I'm using Firefox Mobile on an Android. Just yesterday, when a log in page was opened my firefox would give me a purple "suggested logins" button which allowed me to use the autofill function. Today it has stopped showing up completely. I can no longer use autofill at all. In settings, autofill is switched on. If I type a new username/password combination, firefox asks if I want to save/update it. It still has all of my information. Nothing has updated or changed between now and then. How do I get autofill back?