Mozilla's big plan on Tuesday to set a world record for downloads with the Firefox 3.0 browser hit a snag when its website would not work properly.

Though the big 'Download Day' was set to begin at 6pm GMT, Mozilla's website was down or working sporadically yesterday.

A Firefox spokeswoman said that the company was aware of the problem and "working to get it back up quickly".

"The outpouring of interest and enthusiasm around Firefox 3.0 has been overwhelming (literally!)," according to a blog on Mozlla's site. "Our servers are currently feeling the burn and should be back to normal shortly."

Mozilla will begin registering downloads for the record for 24 hours from the moment the site goes live, according to the post.

Mozilla unveiled a campaign on May 28 to set a Guinness World Record for the most software downloads in 24 hours with its Firefox 3.0 browser. There is no world record for software downloads; Mozilla is trying to create one.

The company asked users to pledge to download the browser on the day it was released, and was even hosting a Download Day event, the Camp Firefox BBQ, at its offices in Mountain View, California, to promote its cause.

The company also has asked Firefox fans to host parties to encourage friends to download with them, and place "Download Day" buttons on their websites as reminders of the big day.