Less Spam is a free Firefox plugin to create a temporary email address for any website on which you are prompted to provide email address. It uses temporary email address services like YopMail, Humaility, and Mailinator to generate that temporary email address.
Less Spam works in a very neat way. When you are browsing a website and are prompted to provide an email address, you can just right click on the email address field, and choose Less Spam to create a disposable email address for you. The best part of Less Spam is that it will always create same email address for you for a website, and a new one for each new website. In this way, you can easily keep track of all the temporary email addresses that are created, and also be sure that no email address would be shared among 2 websites.
Less Spam also provides an option to quickly check email in the temporary email addresses that you have created. So, you actually do not even need to keep a track of all the disposable email addresses. Also check out Link checker for Firefox.
Less Spam is a very thought out plugin for Firefox to quickly obtain disposable email addresses. Download Less Spam here.