The official results aren't in yet. As I write this, the numbers are still being evaluated by the Guinness World Records folks. As you can see by the map,the total downloads on Download Day (at the time of this screen shot) are more than 11 million.
Mozilla says it'll be a few more days before the final results are in.
I did my part to help set the record and was awarded with a certificate.You can get one for yourself by going to http://www.spreadfirefox.com/en-US/worldrecord/certificate_form