Since I did the last update, when composing an email, there are little opaque sort of dots at the lower right of the "to" box which prevent the down arrow from being used if you want to scroll through the addressees.
When I have the screen up to compose an email, there is something in the lower right corner of the "to" box where you put the email addresses of those you to whom you want to send the email. Actually, it looks like the little dots in the corner of this box. If I try to put my cursor on the down arrow to scroll down the list of addressees, it doesn't work. The down arrow is covered partially by the dots.
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Firefox doesn't do email, it's a web browser.
If you are using Firefox to access your mail, you are using "web-mail". You need to seek support from your service provider or a forum for that service.
If your problem is with Mozilla Thunderbird, see this forum for support.
http://www.mozillamessaging.com/en-US/support/
or this one
http://forums.mozillazine.org/viewforum.php?f=39
I contacted Firefox because this problem I am having never happened until I updated Firefox. It is not a problem if I access my email with Internet Explorer. Do you see the little dots at the bottom of this text box? The same ones appear in the "To:" box when I am composing an email. That's why I am thinking it has something to do with Firefox. Those do not appear with Internet Explorer. The dots sit right on top of the down arrow to scroll down on any list of contacts put in the "To:" box and when I put my cursor there, I cannot scroll down, only up. I have to use the arrows on the keyboard. It's a pain.