If you go to our IRC page you may notice that the webchat client looks different...and you are right.
The webchat client we were using (webchat.esper.net) is hosted by esper.net folks and has unfortunately gone offline. While we do expect esper to fix it and bring it back online, we have put Kiwi Webchat in its place until that happens.
If the Esper.net folks decide to let their webchat die they we will be sticking with Kiwi.
Apologies for the inconvenience.