I remember reading something like this awhile ago, not sure if it was here or on another site in the past, but it was something to edit the look of a webpage.
It was a javascript thing I believe, where you could just enter it in the address bar and it would allow you to edit the page.

People used to use it to edit who they were "logged into" as on neo, or edit the amount of neopoints they had in the bank.
Does anybody know what I'm talking about?