Comment 9 for bug 124166

Compatibility certainly implies continued support for the old URLs (they should forward to the new ones). But seeing which comment is being pointed to, even in context, is easy with the right visual cues. To give you an idea of what it looks like, here's a web page that uses the technique:

   http://producingoss.com/#podcasts

Similarly, if the targeted comment were clearly bordered in red (or whatever), there would be no doubt about where the reader's attention should go first.