i've seen some funny scripts. but this is downright silly.

Makes every page whose URL starts with "http://www" (in other words, most of the web) unusable by replacing the page contents with "graffiti" on page load.

At best, this is a "hello world" script that desperately needs to have its default includes changed so as not to pollute Greasefire. At worst, it's deliberate and malicious spam.

...has no sensible purpose. Only serves the purpose of polluting Greasefire.
Gtfo with ur coding homework for elementary schoolboys.