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Firstly, for...in is used to enumerate over object properties, not to iterate through arrays. You should use a traditional for loop for this.

Secondly, you could probably refine your console logging portion a bit. It may not have any impact to application performance, but it would make your console look prettier.

$('body').on('click', '#logReport', function() {
 var i, j, k, l;
 console.group("Live Links:");
 for (i=0, j=liveLinks.length; i<j; i++) {
 console.log(liveLinks[i]);
 }
 console.groupEnd();
 console.group("Dead Links:");
 for (k=0, l=deadLinks.length; k<l; k++) {
 console.log(deadLinks[k]);
 }
 console.groupEnd();
});

As far as I know, this works for both Google Chrome and Mozilla Firefox (FireBug). See here for more information.