Examine source code of tabScrollTop2

{
  "manifest_version": 2,
  "name": "tabScrollTop2",
  "version": "0.4resigned1",
  "author": "Nick Odnari",
  "description": "Page action for page scrolling. Click on the page action icon to scroll to the top, click again to go back to the previous / last position.",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png"
  },
  "homepage_url": "https://github.com/odnari/tabScrollTop2",
  "permissions": [
    "activeTab"
  ],
  "page_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "Scroll up/down",
    "show_matches": [
      "<all_urls>"
    ],
    "hide_matches": [
      "*://addons.mozilla.org/*",
      "*://testpilot.firefox.com/*"
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b62b00d9-0bd6-4a72-b69f-aadcd35f7232}"
    }
  }
}