To kick off the final version of its newest Web browser, Firefox 3, Mozilla created a lot of hoopla about its goal to set a new world record for the most copies of an application downloaded in a single 24-hour period. That really wasn’t very difficult, because there was no official record for that before — Mozilla was apparently the first outfit to call it in to Guinness. Anyway, Mozilla named the date and told the world to set its collective alarm clock for 10 a.m. Pacific time on Tuesday.