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Email adress is visible on another machine with Firefox - WHY?

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Couple of days agon a friend of mine logged in on his FB account on my desktop machine with FF. Day later I open FF on my Laptop and to my suprise I find HIS email adress in FB's login screen.

WHY? HOW?

Couple of days agon a friend of mine logged in on his FB account on my desktop machine with FF. Day later I open FF on my Laptop and to my suprise I find HIS email adress in FB's login screen. WHY? HOW?

All Replies (1)

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Sounds like a combination of two features:

  1. Form history -- shows a drop-down of previous entries into a particular form field when you click in or start typing in a form field
    See: Control whether Firefox automatically fills in forms
     
  2. Firefox Sync -- copies various data between instances of Firefox that you have connected to the Sync service (you can select different categories)
    See: How do I choose what information to sync on Firefox?

If either of those is incorrect, then... ghosts?