The default behavior of Firefox is to show a File Download dialog window when you start to download a file. The user can then choose to save the file or open it directly by choosing an application / the default application. Sometimes however things get messed up and the download window is not showing up anymore.
This can be because you have selected a default action for this file type or because of a software that you have installed which interferes in the downloads. Thankfully changing the default action is not complicated at all and it even is not a problem to bring back the dialog if you prefer that.
Actions are defined per file type in Firefox, go to Tools > Options > Content and click on the Manage button in that window. A menu called Download Actions should open displaying all file types and their corresponding actions. Selecting a file type gives the user the option to remove it or change it.

If you click on Change Action another window opens up giving you three options what you want Firefox to do when a download of that file type is initiated. Options are to open the file with the default application, with another specified application that you need to browse your system for or to save the file to the computer.
I don’t think anyone would need the File Download dialog window but if you prefer that simply remove the action from the menu.
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Well that doesn’t work for me.
New instrustions for people with all one side bar
1.open side bar
Well that doesn’t work for me.
Could be cause of my add – ons
New instrustions for people with all one side bar
1.open side bar
Get into downloads section
2. Click Options
– a menu well pop up
( make sure you have lastest version
3. In the behavior section
- go to download manger type
4. Click circle next sidebar
5. Press ok
6. download should appear now.