YT Smart Downloader от Programmic

YT Auto Queue is a lightweight Firefox extension that pairs with a local downloader to quickly queue and download YouTube videos opened in your browser. Open the videos you want, click a button in the popup and the extension will send the links to a small local server that uses yt-dlp to fetch, encode and post-process files (thumbnail/subtitles embedding, SponsorBlock removal, remux/recode). All downloads and processing happen locally on your machine — nothing is uploaded to third-party servers.