Fixed double-printing the favicon

The issue:

![screen shot 2013-10-11 at 1 28 12 pm](https://f.cloud.github.com/assets/935744/1314050/9a6b19fc-3268-11e3-80b6-be8ee8b83bc0.png)

I'm not sure why were you doing the double drawImage only if `!browser.mozilla`. Was that trying to fix an edge case that I'm not contemplating? Cheers.