I notice that Firefox seems to maintain the order of key:value pairs in objects when iterating over them, while Safari and Chrome seem to sort the object internally (within their respective JS engines).  I  noticed this especially when making select elements.  I store the options as an object, then when drawing the page, I iterate over that  object making option elements. 
For example, I am making a select box that lists users  alphabetically.  Users are identified in the database by an id: 
 
var foo = new Element('select').inject($$('body')[0]); 
var options = {5082:'User A', 5085:'User B', 5074:'User C'} 
$H(options).each(function(name,id){ 
  new Element('option', {text:name, value:id}).inject(foo); 

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