Add New Functionality
You can do more than just change the way Facebook looks. You can add new functionality to Facebook as well. Do you wish you could see your friends’ latest Tweets or Pins right from Facebook? With a little bit of work, you can learn about the Facebook, Twitter, and Pinterest APIs and add completely new features to Facebook.
The decision to use Facebook for kittenbook was arbitrary; we could have used any website we liked. In fact, we still can use any website we like. By modifying the content_scripts array in manifest.json, you can add cute puppies and kittens to other sites. Scratch that—you can add whatever functionality you dream up to other sites. The possibilities are endless. Listing 14.1 shows how to get your JavaScript ...
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