Examine source code of AutoPagedown

{
  "manifest_version": 2,
  "name": "AutoPagedown",
  "version": "1.42resigned1",
  "description": "Add a button to toolbar to start auto pagedown",
  "icons": {
    "48": "icons/autopagedown-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/autopagedown-16.png",
      "32": "icons/autopagedown-32.png"
    },
    "default_title": "AutoPagedown",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{958ec6e1-8558-4cd3-aa79-40c9683f844b}"
    }
  }
}