A little late, but this IS possible using browsers other than IE.
if(window.ActiveXObject) {
nameCtrl = new ActiveXObject("Name.NameCtrl");
} else {
try {
nameCtrl = new ActiveXObject("Name.NameCtrl");
} catch (e){
nameCtrl = (function(b){
var c = null;
try {
c = document.getElementById(b);
if (!Boolean(c) && (Boolean(navigator.mimeTypes) && navigator.mimeTypes[b] && navigator.mimeTypes[b].enabledPlugin)) {
var a = document.createElement("object");
a.id = b;
a.type = b;
a.width = "0";
a.height = "0";
a.style.setProperty("visibility", "hidden", "");
document.body.appendChild(a);
c = document.getElementById(b)
}
} catch (d) {
c = null
}
return c
})("application/x-sharepoint-uc");
}
}
if(nameCtrl && nameCtrl.PresenceEnabled){
// code here
}