Twitter autorefresh when not scrolled or overlaid

Automatically loads new tweets on Twitter.com every 1.5 seconds unless the page is scrolled or an overlay/popup is open. Just a normal autorefresh script but designed to not interfere with reading or commenting.

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manifest.json

{
  "description": "Automatically loads new tweets on Twitter.com every 1.5 seconds unless the page is scrolled or a popup is open.",
  "manifest_version": 2,
  "name": "Twitter autorefresh unless scrolled/overlaid",
  "version": "2.3resigned1",
  "homepage_url": "http://www.jcrichman.com/article/Twitter-Autorefresh",
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ea63f068-a0ab-473c-b712-74a0576954c0}"
    }
  }
}