User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0 Build ID: 20150415140819 Steps to reproduce: (Be sure to select the "Always ask me where to save files" option in the General tab of the Options dialog) 1. Start a download. 2. In the Save File window, type a character that is not allowed in file names into the "File name" text box (question mark, forward slash, backward slash, colon, asterisk, quotation mark, forward arrow, backward arrow; vertical bar). 3. Click the Save button. Actual results: The file did not save, and the files in the current directory of the Save File window were replaced with the message, "No items match your search." Expected results: The user should have been given a warning informing them that the file couldn't be saved because it contained an invalid character.