Helping people with computers... one answer at a time.
Web browsers include features that will remember your login ID and password for various sites for you. We'll look at how that works in Firefox.
How do I eliminate my email/password from automatically showing up on our computer for Facebook? I have searched their help answers. Could it have something to do with our Firefox settings?
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Yep. It's all about Firefox.
Actually, this applies to not only Firefox, but most other browsers as well, and not just to Facebook, but many other sites, too.
You've configured your browser to be helpful. 
If that's not the kind of help that you want, we can change that.
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Remembering Passwords
What you're seeing is an option in most browsers that remembers logins and password for you. When you visit the site for which that login and password apply, the browser automatically fills it in for you:
It can be somewhat handy as one way to keep and manage a lot of passwords to many different sites.
As we'll see below, it can also be a security risk.
Controlling Firefox's memory
Click the Firefox menu, then click Options, and again click Options:
In the resulting dialog, click the Security tab:
Assuming that you want Firefox to stop remembering all password, just uncheck the Remember passwords for sites option.
If you want Firefox to remember some but not all, it supports exceptions as you can see - so leave this checked for now.
Cleaning Firefox's memory
Next, we need to tell Firefox to forget what it's remembered so far.
Click the Saved Passwords ... button:
Here, you can see the list of web sites for which Firefox has saved passwords.
You can either:
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Click Remove All to clear the entire list and have Firefox forget everything.
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Click an individual entry in the list and click Remove to remove only that entry.
If you elect to go the later route, note that Facebook has two entries here. Http and https URLs are considered two separate sites and may each have a copy of your login ID and password. If you want to erase Facebook from this list, you'll want to remove both of them.
Managing exceptions to Firefox's memory
As I alluded above, you can let Firefox remember some, but not all, of your passwords for you. You do that by leaving Remember passwords for sites checked and then logging in to one of your password-protected sites that is not already in Firefox's memory. After you login successfully, Firefox will ask:
You can select:
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Remember Password to have Firefox remember your login ID and password for you.
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Never Remember Password for This Site places this site in the Exceptions list. Firefox will no longer try to save the login ID and password for this site. (Remember that you may need to do this again if you login using both http and https because Firefox sees those as different.)
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Not Now will cause Firefox not to remember the password this time, but it will ask you again the next time that you login to this site.
The security issue in Firefox's memory
Have a look at that saved passwords dialog again:
Click Show Passwords and click Yes when it asks if you're sure.
There they are. Your passwords for anyone to see.
There are several approaches for mitigating this vulnerability. If you do nothing else, go back to the Security Options dialog and select the checkbox to Use a master password. Do that so that a master password would be required to access any of your remembered passwords.
Is it safe to let my browser remember passwords? has more thoughts on letting your browser remember passwords and I encourage you to read it.
Article C5000 - December 2, 2011 « »
Leo A. Notenboom has been playing with computers since he
was required to take a programming class in 1976. An 18 year career as a programmer at Microsoft soon followed.
After "retiring" in 2001, Leo started Ask Leo! in 2003 as a place for answers
to common computer and technical questions. More about Leo.
December 7, 2011 5:06 PM
Passwords stored in a browser can be hacked. Better to use a password manager. LastPass will auto-fill your username & password and is as secure as you can possibly be. And it's free. Roboform is another good option that you'd pay for.
December 8, 2011 4:53 PM
I want to have to type in my e mail address & password everytime I login. Right now my e mail address comes up automatically. I have Windows Vista. I saw your answer for Fire fox but I don't have that.
thanks
December 8, 2011 6:28 PM
@Pam
You mention that you don't use Firefox, but don't mention which browser you use. I'm guessing it must be Internet Explorer. Disabling autocomplete is very much the same on IE as on Firefox.
Click the > tool gear (top right). Select > Internet Options. Choose the > Content tab. Click > Settings button in Autocomplete. Adjust your settings there and close out of the windows.
April 5, 2013 1:26 AM
how to stop google chrome stop showing my email id and password automatically
April 5, 2013 8:49 AM
@Poomanie
In Google Chrome click on the settings icon which is a button with 3 horizontal bars in the upper right hand corner of the browser, then scroll down and click "Advanced settings". Now scroll down to "Passwords and Forms" and click on the check box by "Offer to save passwords I enter on the web." to remove the check mark.