If you are referring to the thumbnail image themselves being horizontal,
there used to be a bug in Firefox that would not respect the EXIF
orientation information stored in a JPEG image file:
https://bugzilla.mozilla.org/show_bug.cgi?id=298619
This bug was fixed in Firefox 26 (Firefox 39 is the current release
version).
If you're referring to the CSS forcing the `.photo-box` containers to wrap,
that sounds like a different issue - one that I was not able to reproduce
in Firefox (nor in Chrome, though as you said it works there).
Hope that helps.
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