I believe this is caused by the website.. some websites might purposely make sure that you cannot use autofill, this is usually for security reasons or anti-spam measures.

If you've disabled the autofill feature, Lockwise will not fill in your login information. To change this setting:

1 - Click on the menu button to open the menu panel. 2 - Click Logins and Passwords. 3 - Click the Firefox Lockwise menu (three dots), then click Preferences.

// The Firefox Preferences Privacy & Security panel will open to the Logins and Passwords section. 

4 - Add a checkmark next to Ask to save logins and passwords for websites to see a prompt. 5 - Add a checkmark next to Autofill logins and passwords so you wouldn't have to type them in each time.

Now that you've configured Firefox to remember passwords, try logging in to the site again.

Click the menu button and select Options. Select the Privacy & Security panel and navigate to the PasswordsLogins & Passwords section. If it isn't already check marked, check Remember logins and passwords and save logins and passwords for sites.

go to menu --> option --> privacy and security --> login and passwords.

If it isn't already check marked, check Remember logins and passwords for websitesAsk to save logins and passwords for websites.

Select the Privacy & Security panel and navigate to the PasswordsLogins & Passwords section. If it isn't already check marked, check Remember logins and passwords for websitesAsk to save logins and passwords for websites.

1)Click the button "MENU" and select "OPTIONS". 2)Select the Privacy & Security panel and navigate to the Passwords Logins & Passwords section. 3)check Remember logins and passwords and save logins and passwords for sites.

Note that there is an auto-fill setting for entering passwords.

A detail like a website remembering you (log you in automatically) is stored in a cookie. If you do not keep this cookie then you need to login again with each visit.

You can use these steps to make a website recognize and remember you:

• you can create an allow exception to keep specific cookies, especially in case of secure websites and when you use "Delete cookies and site data when Firefox is closed"
• Options/Preferences -> Privacy & Security
  Cookies and Site Data: Exceptions

In case you use "Clear history when Firefox closes" or otherwise clear history.

• do not clear the Cookies
• do not clear the Site Preferences

• Options/Preferences -> Privacy & Security
  Firefox will: "Use custom settings for history":
  [X] "Clear history when Firefox closes" -> Settings
• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

• clearing "Site Preferences" clears exceptions for cookies, images, pop-up windows, and software installation and exception for password and other website specific data
• clearing "Cookies" will remove all selected cookies including cookies with an allow exception you may want to keep