Hello PassoGiau,

Would you please go over this article to see if maybe there is something that you may have overlooked (like Private Browsing) :

https://support.mozilla.org/en-US/kb/usernames-and-passwords-are-not-saved

Is this with many websites, some, a few?

Warning: There are some web pages that do not allow browsers to record or fill in the log-in information.

But if you go to the Mozilla Add-ons Web Page {web Link} (There’s a lot of good stuff here) you can try a Form Filling add-on. I found that the form-filler add-on I use is not affected.

It appears to be that particular site, since then Firefox saved credentials for two other sites. Thanks for the tip - I used to use a QuickPassword (I think) add-on but it no longer works on new versons of FF

Is QuickPassword still on your system? Try removing it.

Firefox on my Mojave system is vanilla - no extensions at all.

And your system?

Some website used a login form that isn't detected by Firefox as such. On such a website Firefox won't offer to store the password. This can happen if the login is done by submitting a form, but is done via JavaScript (XHR).

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

Of course - https://www.pepco.com. Seems to be an ASP site

Thanks. The way this form is implemented looks rather complicated as there seems to be a 'form' object that stores a lot of data, so I'm not surprised by Firefox isn't supporting this type of login form and offer to store username and password.

I checked, my Form Filler works.