Sincere the last update on Android, twice I have had Firefox delete and block all cookies, saved logins, and add-ons. Maybe other stuff. I have it synced and it's fine on my desktop. Websites that need cookies to sign in, I can't sign into like Facebook. It won't remember any passwords or prompt autofill or suggest saving the password. And while it keeps the add-ons, they all get disabled. The only solution I have figured out is to uninstall and reinstall Firefox, but it seems temporary.