I saw in the server referrers that people were trying it on other pages where it has no effect, or might have strange effects, so I think it's good to have it t

I saw in the server referrers that people were trying it on other pages where it has no effect, or might have strange effects, so I think it's good to have it there to be sure people understand where it's to be used :) I have added the hackerne.ws domain to the check and also added a no-domain check bookmarklet to the blog post.