Examine source code of Twitter Hexagon Remover

{
  "name": "Twitter's Hexagon Remover",
  "author": "@_NachoSierra",
  "version": "0.0.1",
  "manifest_version": 2,
  "description": "This extension removes the hexagon-shaped frames and replaces them with the classic circular frame.",
  "content_scripts": [
    {
      "js": [
        "jquery.min.js",
        "init.js"
      ],
      "matches": [
        "http://twitter.com/*",
        "https://twitter.com/*",
        "https://www.twitter.com/*"
      ],
      "permissions": [
        "tabs",
        "http://twitter.com/*",
        "https://twitter.com/*",
        "https://www.twitter.com/*"
      ]
    }
  ],
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  }
}