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Greasemonkey is so easy. If you are familar with JavaScript, you’ve literally already known it.

With the help of the free PDF from, learning and finishing my first app only took me an hour. I’ve not finished the book yet, and I don’t have to.

The first one is simple, just replacing some keyword in the web page. And I finished my second app this morning. It can help me fill the form automatically, quite useful when I need to bulk-register lots of account.

It’s an itch-scratching product, with very flat learning curve.