This issue can be caused by corrupted Cookies or Cookies that are blocked.

• check the permissions for the domain in the currently selected tab in "Tools -> Page Info -> Permissions"
• https://support.mozilla.org/en-US/kb/fix-login-issues-on-websites-require-passwords

Clear the cache and remove the Cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Clear the cache:

• Options/Preferences -> Privacy & Security -> Cached Web Content: "Clear Now"

"Remove the Cookies" from websites that cause problems.

• Options/Preferences -> Privacy & Security -> "Use custom settings for history" -> cookies: "Show cookies"

If clearing Cookies didn't help then It is possible that the Cookies.sqlite file in the Firefox profile folder that stores the Cookies got corrupted.

• rename/remove Cookies.sqlite (Cookies.sqlite.old) and if present delete Cookies.sqlite-shm and Cookies.sqlite-wal in the Firefox profile folder with Firefox closed in case Cookies.sqlite got corrupted.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

snooper153 said

downloaded firefox quant. made errors to many times. now sayes passwod is not correct. tried to reset several times. mostly type errors

Hi snooper,

Were you trying to create a Firefox account (Sync)  ?

Or did this happen on another page that requires username and password  ?

When you try to sign in too many times with different passwords, you often have to wait 24 hours to try again .....