Examine source code of Page Top and Bottom

{
  "applications": {
    "gecko": {
      "id": "TopAndBottom@uspex.com"
    }
  },
  "manifest_version": 2,
  "name": "Page Top and Bottom",
  "version": "1.1resigned1",
  "description": "Adds controls to navigate a page to the top or to the bottom",
  "icons": {
    "48": "icons/up-down-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "toabo.js"
      ]
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/up-down-32.png",
    "default_title": "Top and Bottom",
    "default_popup": "popup/top-and-bottom.html"
  }
}