Re-FreshView for YouTube per lozog

This is a forked version of FreshView for Youtube, originally written by Mikhail Andrenkov: https://addons.vaultpit.io/en-CA/firefox/addon/freshview-for-youtube/

FreshView for YouTube™ is an add-on that helps you discover new YouTube™ videos by hiding ones you've already watched.

What can I control?
• The visibility of viewed YouTube™ videos using the Hide Videos checkbox.
• The minimum watch progress of a viewed YouTube™ video using the View Threshold slider.

Are there any restrictions?
• You must be logged into a YouTube™ account with watch history enabled.

What are the permissions for?
• Permission is needed to access browser tabs to find the URL of a given YouTube™ page.
• Permission is needed to read and change data on YouTube™ to modify its displayed content.

Where can I donate?
• Nowhere. Keep your money and enjoy!

YouTube™ is a trademark of Google Inc. Use of this trademark is subject to Google Permissions.