Firefox anonymity

Temporary Inbox (4.5 KB) is a small FireFox extension that creates temporary e-mail addresses. Useful when you’re asked to provide an e-mail address for registering with a site and you don’t fancy revealing your regular e-mail address.
As soon as a site asks you to enter an e-mail address, click on the Random email button in the Temporary Inbox toolbar. An e-mail address will be displayed in the box. Copy this address to the online form of the site you want to register with. Then click on the Check button at the top. This opens the Inbox of your temporary e-mail address. This should now show a message containing, for example, your password or a link that you should click on in order to activate your registration. After six hours, your temporary e-mail address will be automatically destroyed.
Should cut down the spam deluge.
http://www.temporaryinbox.com/firefoxextension.php

Source: Tips & Advice Internet