yes, I think the problem is with recent versions of the dTa extension for recent versions of Firefox on a Mac, not being able to download from sites trhat require authentication - not a Moodle issue per se. I seem to recall finding something about this on the dTA site a while back. It doesn't seem to be a problem for recent versions of the dTa extension for FF on Windows.
Assignment
Downloading assignment files with DownThemAll
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