Why? What doesn't work?
I suspect that they'll never certify it because by the time their QA folks have spent a week verifying its operation....it'll be outdated. So I don't blame them.
I commonly use IE8 (on xp), Firefox (latest disaster) and Chrome (16.current...) interchangably so that I can connect to multiple realms and the console all at the same time.
Host Checker doesn't work with Chrome on Windows. Chrome has just as much if not more market share than Firefox these days, so it would be nice to see it supported.
My suggestion would be to file an enhancement request with your Juniper sales rep or account team. They can file and provide you status updates about your request. Also, the more requests that are filed, the more likely this will be included in a future release.