Examine source code of Keep Scrolling

{
  "manifest_version": 3,
  "name": "Keep Scrolling",
  "version": "1.0.1",
  "description": "A simple extension that moves recommended videos, comments, and description to a scroll-able side bar.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://www.youtube.com/*",
        "https://www.youtube.com/*"
      ],
      "js": [
        "/content_scripts.js"
      ],
      "css": [
        "extension_style.css"
      ]
    }
  ],
  "action": {
    "browser_style": true,
    "default_title": "Keep Scrolling"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@KeepScrolling"
    }
  }
}