Since GMail, HotMail, and Yahoo already support POP3 delivery internally, and accounts for those services can be configured as POP3 in Thunderbird with the publicly available servers for each, exactly when and why would these extensions ever be needed for those services in particular? It seems that this adds an unnecessary level of complexity, since HTTP is not an e-mail protocol and changes to how the "Webmail" interfaces work could break these extensions, which NEVER happens with POP3/SMTP.
When are these actually needed?
