If we're not going to use the snippets from the mozilla.com server then we can remove this line.
But!  Since the content [there](https://snippets.mozilla.com/3/newtab-mockup/19.0a1/20121203143002/Darwin_x86_64-gcc3/en-US/default/Darwin%2012.2.0/default/default/) is basically defined by us, I think it would be a better idea to figure out what we want there, and let the snippets folk know.  (By which I mean email the html to me, and I'll forward it on. ;)