NEW: YouTube downloads on Windows (Firefox)
• Install the free Video Keeper Helper for Windows (Windows 10/11, including Windows on Arm) from https://github.com/rabbitsf/video-keeper/releases/latest, restart Firefox, and the Video Keeper button offers "Download with yt-dlp" on YouTube videos.
• The welcome page and the button tell you which helper to install for your computer.

FIXES
• Cancelling a YouTube download now stops it completely, including the final merge step.
• A slow first start of the helper is no longer mistaken for a missing helper.

• New Downloads list in the popup: every download gets its own progress bar, so you can run several at once.
• Fixed stray errors on open pages after the add-on is updated or reloaded.

• New name: Video Keeper.
• Welcome page with setup tips.
• Streams are saved as standard MP4 files that play in QuickTime, Photos and on iPhone.
• Fixed missing or out-of-sync audio in some streams.
• YouTube downloads (Mac) with the self-updating Video Keeper Helper app.