make sure you specify your private IP address and public IP address in the settings page. the plugin uses by default the hostname which does NOT always work. On a private LAN or if you have a public internet ip address, both are the same. If you are behind a NAT, they are different and you must specify them correctly.
There is not enough information to give you a meaningful reply. Are you both on a LAN. Is your openfire on same LAN, behind a NAT or over a WAN to the Internet? Are you on a coporate LAN with UDP ports blocked? Is your Chrome browser behind a proxy server? The answer is in your logs. Either on the client in Chrome or on the server in openfire.