List of Planned features for Firefox 3. From the article:
# Files could be handled by web services. If I am reading this correctly, this could mean you would be able to click on an attached document and open it with something like Writely or Google Documents. And perhaps, as I asked Santa, the ability to redirect mailto: links to web email services.
# A much needed print support to prevent cut paragraphs and true WYSIWYG.
# The much requested MSI installer which will be a much welcomed improvement for IT administrators as it will ease deployment and updating of Firefox across a company.
# In the security front: support for Microsoft CardSpace and OpenID