Examine source code of Better Scrolling

{
  "manifest_version": 2,
  "name": "Better Scrolling",
  "version": "1.1",
  "description": "Adds vim-like keybindings for scrolling webpages.",
  "icons": {
    "16": "icons/favicon-16x16.png",
    "32": "icons/favicon-32x32.png",
    "192": "icons/android-chrome-192x192.png",
    "512": "icons/android-chrome-512x512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "better-scrolling.js"
      ]
    }
  ]
}