Here's a cool script I just made that allows you to overlay a lightbox with whatever you want in it on any page (Google, this site, etc)

Drag the link below into your bookmarks

and click it on any site you want to cloak / put a "light box" (an overlaying box) on. When you click the bookmarklet it'll ask what you want to show in the box, just type that, hit save and you're done.

Overlay

YO

Here's an example: Google
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Hope you like it and let me know how I can improve it!