One nuance: Some legitimate open-source tools (like yt-dlp ) get flagged by Windows Defender. Why? Because they scrape websites, which behaves similarly to malicious bots. However, legitimate open-source code is transparent. A random "Ghost Downloader" executable is not.

A: No. Google officially removes extensions that violate YouTube's Terms of Service (which includes downloading). Any extension claiming to be a "ghost" will be delisted within weeks.

: Some versions require links to be added one-by-one rather than automatically importing long lists.

A: Not inherently, but because no legitimate company makes it, most variants are either potentially unwanted programs (PUPs) or outright trojans.