Perhaps the largest Firefox Logo in the world.... Have a look.

I've seen someone submit a giant Vista logo for windows before.

http://www.diglog.com/story_technology_design_18736/

And the world's largest RSS button

http://www.johnchow.com/how-to-increase-rss-subscriptions/

Now see this. Stronger.

Firefox's oversized logo. They said it might be the biggest in the world. Ha ha. PNG format.

http://www.maybethisisthebiggestlogooffirefoxintheworld.cn/

Well, that's a long way to go.