Wired! All November 30, 1999

I was downloading addons from Mozilla Firefox Add-ons and found the extensions' released date in certain pages showed November 30, 1999. I'm unable to know when you see these pages the date would change or not, but I want to show you what I saw. Below the Idiocy Level in a searched page, all the addons' released date became to November 30, 1999, but after you click on a result the date is right. Strange date is only in search pages.

https://addons.mozilla.org/en-US/firefox/browse/type:1/cat:73?page=2