Firefox is not allowing LastPass to funciton properly.

I'm sure it's a setting but I can't figure out which one. It has always logged me out when I close or update the browser, which is a minor inconvenience. And in that instance when I got to log in, it has indicated that a verification email has been sent to my account, and historically clicking that does the trick. Now it does one of two things: It will either tell me to click on the verification email sent to my email account but the verification email it never arrives, or it will simply remain static, as if I never entered a password at all. ''Very'' frustrating, please tell me which settings to change and I'll do it. Thanks!