Calling On Firefox People

I've been told a few times that my site is not appearing correctly in Firefox. Each post should have comments at the end and look like this pic. I've tweaked settings and stuff and I'm hoping to have fixed the issue. I need Firefox people to let me know if all seems okay...or not.



Thanks!

*** EDIT ***

Rachel tells me the comments appear okay (so apparantly that's better) but there is a HUGE gap between the top post and the next.

I tweaked some code...any better?