Examine source code of DM Drawer Be Gone

{
  "manifest_version": 2,
  "name": "DM Drawer Be Gone",
  "version": "1.1",
  "description": "Removes the DM drawer on twitter",
  "icons": {
    "48": "icons/box-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "boxRemover.js"
      ]
    }
  ]
}