[foobar33333]

The old logo looks old and it reminds me of Windows XP software. You might think that's wrong and irrational but it doesn't matter. All the UI studies will show thats the most common feeling and feelings matter a lot for marketing

[eitland]

The old one was nice and reminded me of back when Firefox was in an entirely different league, far ahead of everything else: it was so extensible you could even run the worst offending pages in an IE tab.

Today Firefox is still best, bt they've been shooting themselves in both feet repeatedly IMO.