I wrote a tool a couple of months ago, allowing you to view imgur images when your network firewall/filtering system doesn’t allow it. It’s not terribly advanced – but it does the job.
If you’re interested in using it – you can access it here: http://redfern.me/deimgur/.
Any comments would be welcomed – I’ve received an email about the possibility of a Greasemonkey script, which I will look into! It’s kinda rough around the edges at the moment… but it should do the job.