New messages notification
For many years, the new messages notification appeared like this:
It was colloquially referred to as the "orange bar of death" or "orange bar of doom" (OBOD). The Echo extension will do away with the OBOD, by replacing it with its arguably prettier and surely less useful so called "new message indicator", however the user can restore it by using the Orange Bar gadget available on Wikipedia.
To see what the new messages notification looks like by default in various skins, look below (the above bar's look is preserved):
Preview with available skins: