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Stop Firefox from prompting for a login on a specific website

I log in periodically to a specific web site, in which I have an account. Recently, I cancelled (deleted) that account. I also deleted in the Firefox parameters that URL/login/password, and all related cookies. Later, I created a new account on that web site, using Firefox in private mode only, and it works fine. But Firefox prompts, in the login field of that web site, the old account, although for all I know there is no trace of it in the parameters. Not only do I use it in private mode, I also tested using a VPN - just in case the prompt would come from the remote website - and it still prompts that ancient login. Why is that prompt appearing and how do I get rid of it (without affecting all the other websites I use without a problem)? Thanks.

I log in periodically to a specific web site, in which I have an account. Recently, I cancelled (deleted) that account. I also deleted in the Firefox parameters that URL/login/password, and all related cookies. Later, I created a new account on that web site, using Firefox in private mode only, and it works fine. But Firefox prompts, in the login field of that web site, the old account, although for all I know there is no trace of it in the parameters. Not only do I use it in private mode, I also tested using a VPN - just in case the prompt would come from the remote website - and it still prompts that ancient login. Why is that prompt appearing and how do I get rid of it (without affecting all the other websites I use without a problem)? Thanks.

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Hi Guy, Firefox may save usernames and email addresses in multiple places. These include:

  • Saved Logins (menu button > Passwords) - it sounds like you already cleared the old login from this one
  • Form History
  • Address form fill

For Form history, you usually can start typing text to show saved matches, then press the down arrow key, then the Delete (Del) key to remove the match from form history. More info: Control whether Firefox automatically fills in forms.

Address form fill may or may not be available for email address fields from time to time. For more info on cleaning up this data, see: Automatically fill in your address on web forms.

Can you find/resolve the problem in any of those areas?

Oh, finally, I should mention that some sites store a username history in a cookie or local storage. You can clear cookies and local storage entries set by the site this way:

While viewing a page on the site, click the lock icon at the left end of the address bar. After a moment, a "Clear Cookies and Site Data" button should appear at the bottom. Go ahead and click that. Firefox will ask you to confirm; go ahead and confirm.

Hopefully it was one of those things.

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