Brainstorm

Currently, if you primarily use a wifi network with a portal, your bookmark previews very quickly all change to the same image - the login page.  As far as I know, the browser can tell it is being redirected, so it should ideally treat this case more intelligently, so as to not make the feature pointless for portal users.  I was going to file this as an enhancement in Bugzilla, but frankly, I don't have a better idea at the moment; I'm hoping someone else does.