Guinness World Record
Mozilla set record for most software downloads in 24 hours
The official date for the launch of Firefox 3 was June 17, 2008, named "Download Day 2008". Firefox was aiming to set the record for most software downloads in 24 hours.
Download Day officially started at 11:16 a.m. PDT (18:16 UTC) on June 17.With the announced date, the download day was June 18 for timezones greater than GMT +6, which includes half of Asia and all of Oceania.
The large number of users attempting to access the Mozilla website on June 17 caused it to become unavailable for at least a few hours and attempts at upgrading to the new version resulted in server timeouts. The site was not updated for the download of Firefox 3 until 12:00 PDT (19:00 UTC), two hours later than originally scheduled.
When "Download Day" ended at 11:16 AM PDT (18:16 UTC) June 18, 8,249,092 unique downloads had been recorded. On July 2 Mozilla announced they had won the record, with 8,002,530 unique downloads with parties in over 25 countries. As of July 7, 2008, more than 31 million people had downloaded Firefox 3.