Works in Chromium, but not in Firefox Nightly

I mainly use two browsers, Chromium and Firefox Nightly. Your funny gag works in Chromium, and in Internet Explorer too, but not in Nightly.
I get this: http://i.imgur.com/sUUIarN.jpg (lol lolifox)

[nullspeaker]

Does it just not like the base part of the url escaped?
If so, I can probably just use the hexadecimal IP of the website, but I have issues with subdomains that way. I'll keep working on that.