User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 When in the options, "Save files to <location>" is selected, and that location does not exist, and you attempt to download a file, no error messages come up to tell you of the error. The file is simply not saved to the location without feedback to the user. Reproducible: Always Steps to Reproduce: 1. Set "Save files to <location>" in Tools - Options 2. Make that location invalid (Change drive letter, turn off hard drive, etc) 3. Attempt to download a file. Actual Results: The file is not downloaded and no error message appears. Expected Results: An error message should pop-up asking the user what to do