Examine source code of DM No Autoplay

{
  "manifest_version": 2,
  "name": "DM No Autoplay",
  "version": "1.1",
  "description": "Disables the popup autoplay video from appearing on the bottom right of the Daily Mail website.",
  "icons": {
    "48": "icons/dm-no-autoplay-48.png",
    "96": "icons/dm-no-autoplay-96.png",
    "128": "icons/dm-no-autoplay-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.dailymail.co.uk/*"
      ],
      "js": [
        "dm-no-autoplay.js"
      ]
    }
  ]
}