As you may already know from having read "Make Facebook remember my password", you can login to your Facebook account and remain signed in (automatically for future visits) by checking the "Keep me logged in" checkbox before you click on the "Login" button. But what if you want to make Facebook remember your email address, but not your password. This tutorial gives you a trick you can use to make this happen, even if Facebook doesn't offer an obvious way to do that.
Here is tip you can use to spare you from having to manually type your full email address whenever you are trying to log into Facebook. Note that this trick does not work in all web browsers - but it does in Microsoft's Internet Explorer, and in Mozilla Firefox - the two most popular choices.
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At that point, you can do one of two things: if you press the Down arrow on your keyboard, your web browser will display a listing of all email addresses that were typed inside the Facebook sign in form, in the Email text field. This is what the result should look like:
You can then use the Down or Up arrows (on your keyboard) to select one email address or the other: once the one you want to use is highlighted, simply press Enter (Windows or Linux) or Return (Mac).
Another way to load more quickly the correct email address (instead of having to cycle through a potentially high number of irrelevant email addresses), you can start typing the first letter of the email address attached to your Facebook account, use the Down arrow to select it as it appears, and hit Enter.
Tip: your web browser actually displays autocomplete data based on the underlying name of the text field inside the form in question (the Facebook sign in form, in our case). This means that you may see email addresses that were never typed to login to Facebook, but were entered in some other form whose email address field has the same underlying name as the one used by Facebook. (In non techie terms, nothing to worry about if you see other email addresses you don't use yourself to login to one of your Facebook profiles or pages!)