Ahoy there,
Found my first bug/glitch/issue, something related to the chat. I was chatting like normally, scrolling back and forth but at some point the messages suddenly overlapped one another. (Sadly forgot to screenshot) Making everything unreadable including my own, resizing the chat made it worse and upon reducing the chat box again it crashed entirely and gave me a blank empty box. (Screenshot attached, it appears like nobody ever said a thing. All channels showed the same blank state.)
After that, I was able to see one message before it went blank again. Resizing/scrolling through chat did nothing. Problem occurred in the Firefox 8.0 build.
Refreshing the page fixed the issue.