Hi there,
Noticed with version 6.0.2 of Firefox, when I enter a web address, or open a link in a new tab, -sometimes- the page will load 'Cannot find server', but then doing a refresh it'll load as normal. Noticed mainly overseas website URLs with this issue.
Happening on both my laptop (Windows 7 Home), and the desktop (XP Home). Not sure if it has anything to do with the cable internet connection we have with TelstraClear in Lower Hutt.