Examine source code of MaTerialgram

{
  "manifest_version": 2,
  "name": "MaTerialgram",
  "author": "Alvin Hou",
  "description": "Experience Telegram with the new Material Design, dark and light, clean and simple",
  "version": "1.0.5",
  "icons": {
    "16": "icons/icon-dark-16.png",
    "128": "icons/icon-dark-128.png"
  },
  "homepage_url": "https://github.com/CryoliteZ/MaTerialgram",
  "browser_action": {
    "default_icon": "icons/icon-dark.png",
    "default_title": "MaTerialgram",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://web.telegram.org/*",
        "http://web.telegram.org/*"
      ],
      "css": [
        "material-theme.css"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}