Since I replaced Adobe Reader with SumatraPDF on my Windows machine I found this to be a really good feature and it works for the most PDFs. In recent Firefox v

Since I replaced Adobe Reader with SumatraPDF on my Windows machine I found this to be a really good feature and it works for the most PDFs. In recent Firefox version I did not have any problems viewing PDFs. Although they need to make it more responsive, especially on larger documents. But Adobe Reader wasn't really fast to begin with, so it's not that big of a deal.