Just wanted to say that I agree with your rationale here Gijs. Don't feel like we'd want to go back to the old behavior (saving in the /tmp folder) as we deliberately wanted to move to a more "commonly expected" way of saving these kinds of files.
Bug 1738574 Comment 4 Edit History
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Just wanted to say that I agree with your rationale here Gijs. Don't feel like we'd want to go back to the old behavior (saving in the /tmp folder) as we deliberately wanted to move to a more "commonly expected" way of saving these kinds of files. We can double check that UX is in agreement with this approach on Monday.