Should imagine a bit of changing the XUL code will achieve that. A whole lot of ballache just for a pretty picture that'll be quickly replaced by a webpage though.
Parallaxis wants to replace that blank page with a screenshot of a real page so that he can simulate work. Help him - don't mock him Unless he's at my company. Then he's fired.
You know what's funny it that I've been going through various themes over in the add-on section and they all seem to have screenshots of the blank page replace with an image. It looks pretty cool. But none of the theme downloads actually do it. I was hoping the blank page was just an editable html page on my machine. Hey there's an idea! Can I create my own html page, save it on my C Drive, and have the "homepage" open that ?
I have fast dial configured so that the blank page displays my fast dial bookmarks. Of course, there's still a split second when it's blank while fast dial loads...
Here. http://www.howtogeek.com/howto/internet/firefox/spice-up-that-boring-aboutblank-page-in-firefox/