Examine source code of Reader Scroller

{
  "name": "Reader Scroller",
  "description": "Extension for scrolling down a page using for reading or seeing a tab on browser",
  "version": "1.0.0",
  "manifest_version": 2,
  "minimum_chrome_version": "46",
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Reader Scroller",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/icon-16.png",
      "48": "/images/icon-48.png",
      "128": "/images/icon-128.png"
    }
  },
  "developer": {
    "name": "Guilherme Gonzalez",
    "url": "https://github.com/guigonzalezz"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1daa1411-9786-4b3c-bfcc-d0eb37f24e5f}"
    }
  }
}