Scrolling with a scroll wheel on a mouse is fucked (see: does not happen at all).
Regular USB mouse a mac on firefox that is. Not sure how a magic mouse goes.
I could go for some pork.
I'd also drop one or two of the car sites. This is all personal preference but it's essentially showing the same thing over and over which don't think is going to win over any new clients - unless you only want to specialise in doing more of the same. There's enough good work in there to not show the lot. Less is more, show a good variety of high quality work (everything on there is great). If you happen to get more clients interested in your experience working on car sites, you can whip out the stuff that wasn't on the site after initial contact/first meeting and they'll be putty in your hands.