As they did with the release of Firefox 2, Microsoft’s Internet Explorer Team shipped a cake to the Mozilla Headquarters on the release day of Firefox 3. The ‘e’ piece of cake on the right is from the Firefox 2 cake back in October 2006 and has been sitting in a freezer for the past couple years.
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The Firefox Extension Guru's Blog 
Man, the irony is killing me.
[…] released. Here a couple posts from around that day: Mozilla Press Release Firefox 3.0 RELEASED! A Gift From Microsoft’s IE Team Possibly related posts: (automatically generated)Firefox 3.5RC1 Coming Early JuneFirefox 3.0.4 […]