Examine source code of GitHub Tree View

{
  "name": "GitHub Tree View",
  "homepage_url": "https://github.com/tomasbonco/githubtree",
  "author": "Tomáš Bončo",
  "version": "1.0.1",
  "manifest_version": 2,
  "description": "Provides folder structure view for code in GitHub.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "page_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "public/bundle.js"
      ],
      "css": []
    }
  ]
}