On Hudson home page after a few seconds, the ajaxExecutors request is fired and
it's giving JavaScript errors in Firefox:

ev has no properties
http://company.com/hudson/static/41db744a/scripts/yui/event-min.js
Line 45

ev has no properties
event-min.js (line 45)
getTarget(undefined)
onContextMouseMove(undefined, Tooltip tt)container-min.js (line 97)
onmousemove()hudson-behavior.j... (line 247)
[Break on this error] delete listeners[index][this.WFN];delete
listeners[index][this.FN];listeners.spl...