Examine source code of Twitter Zen

{
  "manifest_version": 2,
  "name": "Twitter Zen",
  "description": "Replaces Twitter's Explore/Trending tabs for a more peaceful viewing experience.",
  "version": "1.0",
  "icons": {
    "128": "icons/twitter-128.png"
  },
  "content_scripts": [
    {
      "css": [
        "./twitter-zen.css"
      ],
      "js": [
        "./twitter-zen.js"
      ],
      "matches": [
        "*://www.twitter.com/*",
        "*://twitter.com/*"
      ]
    }
  ]
}