Firefox (developer) saving images not showing up in windows recent files

The Files saved by Firefox are not showing up in the “recent files” tab in quick access on Windows, in contrast to the files saved by other browsers. How is that? Maybe there is some Information, Firefox isn’t sending to Windows.

How are you saving the images? If I right-click > Save Image As… (into a TEMP folder under Downloads) then it does show up in Quick Access.