Firefox, Opera and Masonry (JS)

Hi.

I am facing a problem that is beyond my capabilities. I thought at first that it was only a CSS problem, but it seems now that JS is in line too. In fact it would be a cross problem between JS, the theme CSS (Tarski) and Masonry.

Where: http://www.hangar217.com/fr/oeuvres-des-membres (using Drupal 7 + Masonry module).

What: Masonry is supposed to give you a nice «wall» of pictures (Safari and Chrome: ok).

But in Firefox the only thing I get is a single column. On another forum (http://csscreator.com/topic/firefox-...-drupal-tarski) someone suggested that the faulty document would be: .../libraries/masonry/jquery.masonry.min.js?md9xga

It would be much appreciated if someone could take a look at this problem.

Thank you.