Examine source code of Scroll++

{
  "manifest_version": 2,
  "name": "Scroll",
  "description": "A extension that scrolls the current page down. You can use it for pages like Twitter, Facebook ect.",
  "version": "0.1.27resigned1",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "kkbkeemffgiheholedniiicjhipnpdlp@chrome-store-foxified-unsigned"
    }
  }
}