The old default skin is no longer supported. It's available, you can use it, but it's not being updated. The newer (it's not really new - we've been using it for several years) skin (FGRV 2.0) has been toned down so it is not as bright as when we first saw it. Don't get me wrong: I loved the colors on the old default skin, but FGRV 2.0 is the currently supported skin.
On a side note, I see that the Default Style seems to to fit to the full page width, whereas the FGRV 2.0 one is much narrow. I wonder if there is a setting to make it full screen width.
Its full screen width on mine. Just Forums section is 3/4 across but that is due to the side bars on the top portion and other items under that.
This is a full screen shot of what mine looks like.
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2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln
You have way more blue showing around the outside edge than mine does at 100% screen view. If I change my computer settings to Zoom out to only 90% it starts to look a bit like yours.
I'm using a MacBook Air and Firefox. I tried using 'Command' + to zoom the screen, but it didn't work. When I went to 'View' in the very top menu bar of Firefox and clicked on 'Zoom' and then 'Zoom in', the page filled the screen.
Now back to my previous program.
1999 Casita Liberty
2015 Escape 21
It's available, you can use it, but it's not being updated. The newer (it's not really new - we've been using it for several years) skin (FGRV 2.0) has been toned down so it is not as bright as when we first saw it. Don't get me wrong: I loved the colors on the old default skin, but FGRV 2.0 is the currently supported skin. 
Prairie Schooner
1992 Scamp Side bath
2009 Escape 19
Linear Mode
