Examine source code of Pause on Scroll

{
  "manifest_version": 2,
  "name": "Pause on Scroll",
  "version": "1.0",
  "description": "Automatically pauses videos when you scroll the page.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d05cbdcd-3c29-4bb6-89b2-f4fee7d4bcec}"
    }
  }
}