Usually when you want to download something from a web site the site will ask for your email address. From the next day of downloading you will be getting unwanted spam mails in your inbox. This firefox extension will protect your mail box from spams. You can create temporary disposable email addresses for just downloading purpose by pressing the random email button. It will create your temporary inbox. Copy and paste into the field. Wait a while then press the check email button.View screenshot
It's easy to use, requires no registration and the temporary email gets automatically deleted after 6 hours, if you can't bother deleting it yourself.