The comments for the first answer aren't wrapping, and seem to be hiding behind the side bar, and continuing on the other side in Firefox 4.0 on Windows
This is a known bug in Firefox 4: Bug 418975 - Soft hyphen not working in tables. It has meanwhile been fixed, so a future update of Firefox probably resolves this.
I have the same issue in Firefox 4.0.1 on Mac OS X, both for code fragments and for normal text in comments. No problem in other browsers though.
I suppose you are referring to this comment which could wrap differently for you.
Confirmed on a portable browser Windows 7 x64 Firefox 4 RTM:
Doesn't occur on my current browser Windows 7 x64 Firefox 6.0a1 (2011-04-14).