Download menu

[Admin]

x2
that is, if idm is installed in the system, but not selected as a downloader, and there are no extensions, then the browser's internal downloader not only shows an icon, but also downloads using idm? (not showing idm download window, and not adding download to idm?)

No, internal downloader can recognize IDM and can transfer download task to IDM.
But will not use it internally.
internal downloader itself always use native HTTP connection by default.