We have just released the initial version of the 33Mail Chrome extension here.
The main purpose of this extension is to make creating a 33mail alias as simple as possible. Whenever you visit a site and the extension detects an email address signup field it will automatically fill in an appropriate 33mail alias saving you the trouble of doing all that typing. You can also choose to have it not auto-fill the email address fields and rather only fill it when you click on the handy button in your browser bar.
We already find the extension very useful and hope that our users do too. We would love to hear your feedback and feature requests for the extension so leave a comment here or on the extension page here.