Just to be positive, I just tested this template with v1.3.5 and all is well. Since I made this one using the default overrides, there are no known issues with Firefox or MSIE6 / 7... like the problem or similar to what the Candied templates had before recent revisions.
Although, I overlooked a whitespace issue under the logo wrapper. It's an easy and quite common fix, so all you have to do is go into the default template folder and copy the tpl_header.php from the 'common' folder. Go into the Blue Strip template folder and paste the copy into the 'common' folder there. You only have to apply a tiny hack.
Find in the tpl_header.php;
Only delete the line in red.
<?php } // no HEADER_SALES_TEXT or SHOW_BANNERS_GROUP_SET2 ?>
<br class="clearBoth" />
I tested the fix with the three browsers stated prior and it works.