Firefox does NOT remember my saved logins.
The article at the link below makes no mention of how to fix the problem if it is NOT a new login! Firefox logs me out of iCloud for Windows EVERY time I close my browser even though I have selected "Keep me signed in" and even though I saved and confirmed the login. None of the Help articles has a resolution that works for this issue. It is very recent behavior (the last few weeks).
https://support.mozilla.org/en-US/kb/password-manager-remember-delete-change-and-import
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Your ‘logged-in’ status is stored in special cookies. If the cookie is removed, you are logged out.
Type about:preferences#privacy<enter> in the address bar. The button next to History, select Use Custom Settings.
At the bottom of the page, turn on Clear History When Firefox Closes. At the far right, press the Settings button. Turn on ONLY Cache and Form And Search History leaving the others off.
Thank you. However, as I said, that "solution" does not solve the problem. I made those changes when the problem started.
https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save
Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.