How do I unlock my facebook account?

[Mahe]

If you change your browser or your service provider of your internet provider may lead to this problem, "try logging into Facebook from a device you've logged in with before" it implies the browser you already used nor the laptop or computer. Your chrome and firefox will look as different device for facebook.

Try using your facebook with the browser you already used for firefox. In some cases date of birth we entered may differ from their data. I hope this will work for you