Examine source code of Aspirin

{
  "manifest_version": 2,
  "author": "selmansamet",
  "name": "Aspirin",
  "version": "1.2",
  "description": "You don't have to see other's followings or likes in twitter flow. Just get an aspirin.",
  "icons": {
    "64": "icons/icon-64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/"
      ],
      "js": [
        "aspirin.js"
      ]
    }
  ]
}