You don't need to do anything, just enable the plugin and away you go.
The lesson you are currently watching will be scrolled into view in the side menu and highlighted so you can easily see where you are at in the course and the next/previous lessons.

Install

• License: GNU General Public License v2.0 or later
• Weekly downloads: 0
• Average daily users: 16
• Rating: 0/5 of 0 ratings
• Created: 2023-04-06 15:40:02
• Last updated: 2023-08-08 16:30:32
• Homepage: https://willadams.dev
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/traversy-scroll-active-lesson/
• API: {f2a96490-4e5a-4ab4-8652-3691a798b69a}