A compelling "fix" and standout feature for a Firefox playlist downloader would be Smart Incremental Syncing

| Name | Type | Playlist Support | Format | Maintenance Frequency | | :--- | :--- | :--- | :--- | :--- | | (with companion app) | Extension + Desktop | ✅ Yes (uses yt-dlp backend) | MP4, MP3 | Weekly | | Video DownloadHelper | Extension only | ✅ Limited (max 25 videos) | WebM, MP4 | Bi-weekly | | youtube-dl-interface | Web extension (Wraps CLI) | ✅ Full | Any | Daily (via yt-dlp) | | Playlist Downloader PRO (Paid, $4.99) | Extension | ✅ Unlimited | MP4 4K | Monthly |

If your previous plugin is gone, here are the top replacements for 2026:

User scripts operate at the DOM level and don’t require Mozilla’s review process, so fixes get pushed within hours (not weeks).

Any discussion regarding the "fix" of YouTube downloaders must address the legal landscape. The repository of many popular open-source video downloaders, such as youtube-dl, has faced takedown notices under the Digital Millennium Copyright Act (DMCA). This legal pressure forces many Firefox plugin developers to abandon their projects.

: It never stays broken for long, handles massive playlists flawlessly, and supports high-resolution video and audio extraction. 2. 4K Video Downloader (Graphic Interface)

Firefox's modern extension system is designed with security and privacy in mind. However, this can make the browser's built-in video downloader plugins less powerful than some native apps. It puts sandboxed walls around what a simple browser extension can see, especially deep within the browser's media pipeline.

Now for the part you've been waiting for. These are proven, step-by-step fixes to get your YouTube playlist downloader back in action.

alexta69/metube: Self-hosted video downloader for ... - GitHub

As of March 2026, many users reported that popular downloaders like Video DownloadHelper experienced issues with YouTube's evolving structure.

⚠️ Free version downloads playlists but may limit quality or speed.

May 2026 Target Audience: Firefox users, content curators, offline video enthusiasts

When your extension breaks, don't panic. Follow this systematic troubleshooting process to diagnose and potentially resolve the issue.