Footer taking different sizes in different browsers

Question

I am building an web application .

I have added a footer to the page .

The footer become larger in Firefox ( horizontally ). Any possible reasons ?

The footer is a sticky div as mentioned here - http://ryanfait.com/resources/footer-stick-to-bottom-of-page/

Container CSS -

.container{

    background: #ffffff;
    width: 90%;
    min-height: 100%;
            height: auto !important;
            height: 100%;

    background: #FFF;
    margin: 0 auto -60px;
    max-width: 1200px;/* a max-width may be desirable to keep this layout from getting too wide on a large monitor. This keeps line length more readable. IE6 does not respect this declaration. */
    min-width: 768px;/* a min-width may be desirable to keep this layout from getting too narrow. This keeps line length more readable in the side columns. IE6 does not respect this declaration. */

}

Footer CSS -

#footer {
        height: 60px;

        background-color: #F0F0F0  ;

    width: 90%;
    margin: 0 auto 0;

    -moz-border-radius: 2px;
    border-radius: 2px;
        }

Answer 1

Just add these two property of footer element as of container element

#footer
{
max-width: 1200px;
min-width: 768px;
}