I just created a separate "Idea" for: https://connect.mozilla.org/t5/ideas/add-delete-button-to-address-bar-result-matches/idc-p/21139/hig...
Adding a delete button to the downloads Tab is an awesome idea.
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Hi, do you mean the list that drops down from the toolbar button, or the "Show all downloads" list?
Currently, the right-click context menu has options to either: