Examine source code of TopScroll

{
  "name": "TopScroll",
  "short_name": "TopScroll",
  "description": "__MSG_appDesc__",
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "default_locale": "en",
  "version": "1.8.5",
  "manifest_version": 2,
  "offline_enabled": true,
  "author": "Anton Gorbunov",
  "homepage_url": "https://github.com/sv3k/topscroll",
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "basic.css"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "__MSG_browserAction__",
    "default_popup": "options.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "applications": {
    "gecko": {
      "id": "hnninpkmflibadgihijdmlilikhdgajj@chrome-store-foxified-709055232"
    }
  }
}