Ajax(able) Yahoo Mail

Its really cool, with a small extension to Firefox you can have your yahoo mail ajax enabled. I have used it and found very useful as I get many messages that are just to be read and discarded ,not forwarded hence it proved quite easy.

Overview:
Adds AJAX support to the current Yahoo! mail and makes it a little more friendly. - Preview your messages without leaving your inbox. Adds a small arrow next to your email list. Click on the arrow to preview the message. - Send back messages with a single click using Instant Reply.