That bookmarklet comes from squarefree (and looking at his about page, Russell Beatie should learn to credit other people): https://www.squarefree.com/bookmarklets/zap.html

I guess it's an encoded version of the same JavaScript, all right.

I expect I was first introduced to it through squarefree, but the Beatie page is a simpler place for a surfer to land for that one specific thing, which is why I chose it. I didn't realize it was also a straight-up, uncredited copy.