User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 Build ID: 20150525141253 Steps to reproduce: Downloaded multiple large files files from Google drive. Also happened when downloading large installers (more then a gigabyte) from filehipo.com and left downloads manger open from top toolbar. Actual results: Downloads were stated as incomplete (looked stuck around 25%) in downloads when I checked my computer about 1 hour after they had been started. When I clicked on the file in the downloads section it looked as if it had been completed as normally. Expected results: The downloads should have stated being completed with being clicked on.