There was a time when WebKit (I think it was WebKit) stored metadata of downloads in extended attributes. Like the URL you were downloading it from.

https://movq.de/v/f79b94485a/s.png

This was really useful. 🤔 Chromium also did it for a while and then they removed it due to privacy concerns. Now none of the popular browsers do it anymore. 🫤

• https://bugzilla.mozilla.org/show_bug.cgi?id=665531
  
• https://chromium.googlesource.com/chromium/src/+/a9b4fb70b4318b220deee0da7b1693d16b8ed071
  
• https://bugs.webkit.org/show_bug.cgi?id=260778