Mofunzone used a cheap strategy of buying similar domain names so that they can redirect to their own site and take a bit of business. What you're typing in is (with a "U", when it is (spelled "armor".
Well, I believe master must've solved your problem. Apparently mofunzone is going down, for I've never seen this type of strategy used in other gaming sites. That I know of, at least. You should be good if you type it right.
It's a thing ArmorGames didn't (or hasn't been able to) do just yet, buy all those misspelled domainnames of websites... which is something a con-colleague of them has already taken care of. For example, I tried to change letters of kongregate and it turns out that they have bought/reserved nearly all misspelled versions of their website's name, because it either shows a 'domain reserved' message or redirects you to the intended website of them.