When using 'Advanced Search', I found the example date format shown in the 'date' fields were fine in IE, but broke out of the page in Firefox. I fixed this by making a small adjustment to the template.
tpl_advanced_search_default.php
Line 58
Change:
<fieldset class="floatingBox forward">
to:
<fieldset style="margin: 0 0 0 8px">
HTH
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