Scrollbar Anywhere

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Scrollbar Anywhere",
  "version": "2.17",
  "description": "Click and drag anywhere to scroll the page.",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Click to toggle Scrollbar Anywhere"
  },
  "options_page": "options.html",
  "manifest_version": 2,
  "minimum_chrome_version": "49"
}