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nothing, it's a joke about upgrading from a command prompt to a gui

No, he put a || where I think it was meant to be &&:

if (($.browser.name == 'msie') || ($.browser.name == 'firefox' || $.browser.versionX < 3)) {

This is true. Sleep deprivation and logic don't mix well. :)

shame, would have been funnier if it were a joke.