Examine source code of Autoscroll

{
  "description": "Scroll to the real end of the page. This is supposed to replace the eraser on the end key",
  "manifest_version": 2,
  "name": "autoScroll",
  "version": "0.5.0",
  "icons": {
    "48": "icons/as.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": "icons/s.png",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  }
}