1) A key which marks remaining articles in this thread as read, and takes me to the next thread
2) I see that a signature, when detected and displayed, is in light-grey rather than black text. How about a slider to set the darkness level.
3) If I start a reply but then discard it, the warning I get says: Article has not been send. Your message will get lost if you close the window. Are you sure to close the window?
It would be more correct to say: Article has not been sent. Your message will be lost if you close the window. Are you sure you wish to close the window?
Changes are in bold.