TOOLS - OPTIONS - PRIVACY Under HISTORY

           FIREFOX WILL: - Select REMEMBER HISTORY of the 3 options

worked for me, had the same issue with Hotmail now remembering signin between sessions

Websites remembering you and automatically log you in is stored in a cookie.

• Create an allow cookie exception (Tools > Options > Privacy > Cookies: Exceptions) to keep such a cookie, especially for secure websites and if cookies expire when Firefox is closed.

Make sure that you do not run Firefox in Private Browsing mode.

• https://support.mozilla.com/kb/Private+Browsing
• In Private Browsing - Use Firefox without saving history mode all cookies are session cookies that expire if that session is ended, so websites won't remember you.

• Do not use Delete browsing, search and download history on Firefox to clear the "Cookies" and the "Site Preferences"

Clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.

I done both of these things, but it still won't stay logged in (It will remember the password, and log-in, but I physically have to click on the sign in button. I recently upgraded to Foxfire 8, so I am wondering if this is the issue.