User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0 When the download manager is set to download to a certain disk (say, for instance a flash drive that is not plugged in at the moment) and one tries to download a file, the download manager will not start at all and no error message is given to let the user know that the drive does not exist. Reproducible: Always Steps to Reproduce: 1. Set to download to a flash drive or other disk then unplug the disk 2. Try to download a file 3. Actual Results: The save file message comes up, and upon clicking Save, seemingly nothing happens at all. Some users may think that the download simply finished quickly and will search for the file and not be able to find it. Expected Results: Show an error message that the drive does not exist, or prompt the user to save to a different location.

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