https://support.mozilla.org/en-US/kb/security-and-passwords-settings

On the Security tab in Options. to the right of Logins click the Exceptions button. Then click to highlight the website you said "Never" to and then use the Remove button.

the-edmeister said

https://support.mozilla.org/en-US/kb/security-and-passwords-settings On the Security tab in Options. to the right of Logins click the Exceptions button. Then click to highlight the website you said "Never" to and then use the Remove button.

I have done it before, but when I enter the website the password prompt doesn't appear, leaving two blank input boxes.

Type about:preferences#security<enter> in the address bar.

Under Logins, Turn on Remember Logins To check the passwords you have listed, press Saved Logins.

Is that website listed? Delete its entry.

Remove History For One Site Open the History Manager <Control><Shift> H. In the search bar, enter the name of the site. Right click on one of the listings and select Forget About This Site. This should remove all information, including any passwords / settings.

See also:

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

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks and history and cookies and passwords and cache and exceptions, so be cautious. If you have a password or other data like bookmarks from that domain that you do not want to lose then make sure to backup this data or make a note.

Can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data from that website will be saved once again.