Examine source code of Scroller

{
  "manifest_version": 2,
  "name": "Scroller",
  "description": "View or hide the scrollbars.",
  "version": "0.0.1",
  "icons": {
    "16": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon.png"
    },
    "default_popup": "browserAction/index.html",
    "default_title": "overflow"
  },
  "permissions": [
    "activeTab"
  ]
}