Show download links as tooltips in the Downloads panel.

[circcc]

Hovering the cursor over the file name being downloaded in the Downloads panel will display the file name as a tooltip, but I wish the download link would appear as a tooltip instead.

[CeTeBuK]

I think there is a related issue: https://connect.mozilla.org/t5/ideas/display-domain-for-in-progress-downloads/idi-p/10315