Surely that's what steverb means. That tab is describing a crash: the page renderer or javascript interpreter segfaulted. The user experience is obviously much better in Chrome because of the process sandboxing, but the bug is likely the same.
Yes. It just causes the single page to crash. The rest of my tabs are unaffected. I personally don't think this is a big deal, unless there were some way to execute evil code. It's not the first time I've had a page crash a Chrome tab.