It seems it is (or was) the site. It's availability was intermittent for me. Firefox gave an 'operation timed out' message after a while even though the home page appeared to have loaded. Firefox was probably trying to contact a link on the page that lead to some unavailable content at the time. When that happens, the browser will give up trying after a while and give an error message.
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Error: Keyboard not attached. Press any key to continue..