According to the docs, I would expect the Firefox behaviour. Am I right?

gistfile1.js

head.js(
    {jquery:"https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"},
    {jqueryui:"https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.6/jquery-ui.min.js"},
    {gmaps:"http://maps.google.com/maps/api/js?v=3.2&sensor=false"},
    {openlayers:"js/openlayers/OpenLayers.js"});

head.ready("jquery", function(){
    console.log("jquery ready");
});

head.ready("openlayers",function(){
    console.log("openlayers ready");
})

head.ready(function(){
    console.log("all ready");
})

/* 
Firefox (Firebug) says: 
jquery ready
openlayers ready
all ready

Chrome says: 
all ready
jquery ready
openlayers ready
*/

this is fixed on the latest version of head js.

https://github.com/headjs/headjs/blob/master/src/load.js

here is the commit:

headjs/headjs@6c56c56

Thanks!