Google AutoSuggestion:

Autosuggestion may not work properly if you are using Google Autosuggestion service provided below, use waitingfunction on textbox change event, so that, input will be slow and google will generate proper response.

//max sets the number of results to show in dropdown, up to 10
const max=10,C=Components,g=C.ID("a2e61347-0ab0-4597-879f-33aba7194225"),Ci=C.interfaces,Cg=Ci.nsIComponentRegistrar;
function gS(){};
gS.prototype={
startSearch:function(s,p,t,l){
var j=this,q=C.classes["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
q.onload=function(){
var r=[],n=q.responseXML.getElementsByTagName('suggestion');
for (var i=0;i<Math.min(10,n.length);i++)
r.push(n[i].getAttribute('data'));
l.onSearchResult(j,new gR(4,r));
};
q.open('GET','http://google.com/complete/search?output=toolbar&q='+encodeURIComponent(s),true);
q.send(null);
},
stopSearch:function(){},
QueryInterface:function(a){return this}
}
function gR(z,r){this._z=z;this._r=r;}
gR.prototype={
_z:0,_r:[],
get searchResult(){return this._z},
get matchCount(){return this._r.length},
getValueAt:function(i){return this._r[i]},
getStyleAt:function(i)
{ if (i == 0)
return "suggestfirst";
else
return "suggesthint";
},
getImageAt:function(i){return ''},
QueryInterface:function(a){if(a.equals(Ci.nsIAutoCompleteResult))return this}
}
var gF={createInstance:function(o,i){return new gS().QueryInterface(i)}}
var gM={
registerSelf:function(c,f,l,t){c.QueryInterface(Cg).registerFactoryLocation(g,"Google AutoComplete",
"@mozilla.org/autocomplete/search;1?name=google-autocomplete",f,l,t)},
unregisterSelf:function(c,l,t){c.QueryInterface(Cg).unregisterFactoryLocation(g,l)},
getClassObject:function(c,a,i){return gF},
canUnload:function(c){return true}
}
function NSGetModule(c,f){return gM}