When addressing a message, I click on the "TO" to see all my contacts. At the end of the list there are several contacts related to porn sites. These do not show in my contact list. How do I delete these contacts?

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/] <br /> or this one <br /> [http://forums.mozillazine.org/viewforum.php?f=39]