Category Tabs in FireFox

Hi all !
I installed Cat Tabs v1.1 on my zen cart version 1.3..6 when viewed in IE everything is cool however when viewed in FireFox things get weird all the content moves over all the way to the right so basically the page consists of the Main wrapper header and footer on one side of the page and the content to the right take a look here, https://www.hbsavings.com/zen

thanks in advance !

Try changing this in stylesheet.categorytabs.css:

#navCatTabs {
float:left;
width:100%;
background:#FFFFFF url("") repeat-x bottom;
font-size:93%;
line-height:normal;
}

to float right:

#navCatTabs {
float:right;
width:100%;
background:#FFFFFF url("") repeat-x bottom;
font-size:93%;
line-height:normal;
}