Firefox keeps signing me out google accounts/websites

Hello, Firefox keeps signing me out of Google websites like google.com and youtube.com when I close out the browser. I recently switched from Google Chrome and was wondering if this was a Google issue or if it was Firefox. It only keeps me signed out of Google accounts, and keeps me signed in for every other website. I have the "Delete cookies and site data when Firefox is closed" box unchecked and it still keeps me logged out, and I have "cookied" unboxed in my Clear History settings as well. I'd like to have this issue fixed as soon as possible for school-related reasons.