User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:53.0) Gecko/20100101 Firefox/53.0 Build ID: 20170109030209 Steps to reproduce: Downloading a file using the Nightly version and going in to the downloads library. Actual results: Black bars on the downloads, only the name of the file in visible. Expected results: See the how much time left for the download,speed. This is not happening in the stable Firefox version.