Examine source code of YouTube Still Here

{
  "manifest_version": 2,
  "name": "YouTube Still Here",
  "description": "Prevents YouTube and YouTube Music from pausing your playlists by showing 'Video paused. Continue watching?' dialog",
  "version": "3.0",
  "browser_action": {
    "default_icon": "./icons/play.png"
  },
  "icons": {
    "16": "./icons/play16x16.png",
    "48": "./icons/play48x48.png",
    "128": "./icons/play128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "stillHere.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{daebcf31-5a38-4e54-a742-6b031e2a53ed}"
    }
  }
}