Are you talking about a block about 70% down, just below it are pictures of toys? That block is a video screen. If this is it, the video did not load. Try reloading the page a few times. Also, make sure that your plugins are up to date. Firefox > Add-ons > Plugins. Just above the first plug is a link to check the plugins.

You can look for a (possibly colored) Lego icon on the left end of the location bar that indicates that Firefox is blocking a plugin.

• https://support.mozilla.org/kb/why-do-i-have-click-activate-plugins
• http://kb.mozillazine.org/Issues_related_to_plugins#Click_to_Play