Bug 837883: Redirect /firefox/firefox.exe to home page.
Fix bug 838362: Add engagement 2012 infographic.
Merge pull request #619 from pmclanahan/bug-837883-firefox.exe-redirect

Bug 837883: Redirect /firefox/firefox.exe to /.
Bug 838362 - compress infographic. JPEG FTW.
Bug 838362 - moar compreshunz