Now I have to go through two steps after initiating a download: click on the download icon, then click on "show all downloads".
This seems a bit of a step backwards, but thanks to someone on one of their forums, I found the fix:
Type about:config into location/address/url bar and press the "Enter" key to open the about:config page
Use the Search bar at the top of the about:config page to locate
browser.download.useToolkitUI
"Toggle" from "false" to "true"
