Remove that pesky download window that appears after downloading a file by adding the Firefox Download Statusbar Add-on to your browser. Alternatively editing the about:config settings as shown below can also disable this window from being displayed.
- Open a new tab in Firefox.
- In the address bar type: about:config
- Locate browser.download.manager.showWhenStarting by copying and pasting the bold text into the Filter box.
- Double-click the name or value to change the value from True to False. Once done close the tab.
If you've hidden your download Window it can still viewed by clicking Tools and then Downloads or pressing Ctrl + J.