It's firefox being paranoid. It's because Google's secure connection certificate is registered to google.com and not google-analytics.com Nothing to be worried about, as I'm pretty sure the latter (and the former) is owned by Google. Never seen it appear on here, though. You usually get something like that when actually visiting the site. As for why it's here, it's probably one of Jordan's traffic monitoring programs.
Nothing to worry about, as long as it's not coming up on every page.