GreaseMonkey is an extension for Firefox browser that easily allows you to change the rendering of a web page received by your browser. The example image shows how Greasemonkey can insert prices from competitive booksellers right into Amazon..
Well, you can easily imagine how Greasemonkey will blow up business models (as well as your mind). The total control over the content you see with your web browser had slipped away from content providers’ hands (the web site who is sending you the data i.e. Amazon, Google, …) to content consumers’ hands (this means you … well, if you use a clever browser).
Client power: you modified the page your browser receives (greasemonkey)
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