• Click the (empty) input field on the web page to open the drop down list
• Highlight an entry in the drop down list
• Press the Delete key (on Mac: Shift+Delete) to remove it.

Firefox will remember new form data when entered.

• http://kb.mozillazine.org/Deleting_autocomplete_entries

• http://kb.mozillazine.org/Password_Manager
• http://kb.mozillazine.org/User_name_and_password_not_remembered

• Saved Password Editor: https://addons.mozilla.org/firefox/addon/saved-password-editor/

Thanks for the reply. However, I cannot any location to click on to "Click the (empty) input field on the web page to open the drop down list".

For the web page in question, the only empty fields are the user name and password. No drop down list occurs — on instructions on what to enter.

You can see all stored passwords here:

• Firefox > Preferences > Security: Passwords: "Saved Passwords" > "Show Passwords"

If you have saved a password for a web page then you can open a drop down list on that web page if you double-click the name field to see all user names.

Make sure that you do not run Firefox in permanent Private Browsing mode if Firefox doesn't offer to store passwords.

• https://support.mozilla.com/kb/Private+Browsing

To see all History and Cookie settings, choose: Firefox > Preferences > Privacy, choose the setting Firefox will: Use custom settings for history

• Deselect: [ ] "Always use private browsing mode"

Thanks for your second reply. The problem is apparently in the Firefox software, since it occurs with all Mac users even though their personal information is different. In other words, the problem follows the website.

I have been unable to find a systematic way to duplicate the problem. It initially occurred while I was changing user names and passwords. I didn't want to update some of the changes in the "saved passwords". My recollection is that I ignored the "Remember password" prompt. URL's were changed. The "Remember password" prompt no longer appeared, and did not reappear when returning the the web sign-in page.

For those web pages, there is no "Remember password" prompt. However, those pages are not included as exceptions to the "Remember passwords for sites" exceptions. Similarly, the sites do not appear in the saved passwords.

I have read the recommended reading; none seem to apply. For one of the sites, I was able to produce a pull down list for user name. However, the Shift + Delete action produced no change.