odd issue in print-preview on firefox

odd issue in print-preview on firefox


I have a very strange issue.
From tests and debugs I have done until now I concluded the problem
for this particular browser lives in my $.each callback, as soon as
is called:
[...]
this.render = function() {
        $(acorde_seletor).each(function() {
[...]
but if I do:
[...]
this.render = function() {
    return;
    $(acorde_seletor).each(function() {
[...]
I have at the given moment my html estructure viewable by print-preview.
So what to do?
HTML FILE: http://websaudavel.com/proj-acordes/svn-acordes
JS FILE: http://websaudavel.com/proj-acordes/svn-acordes/javascript/acordes.js
PS.: acorde(s) -- pt-br = chord(s) -- en-us
How to solve this hassle?