How to Pause Downloads in Firefox
Pausing downloads can be important if you’d like to start a download, close Firefox, and come back to the download at a later time. To do this simply open up Firefox and find a file you’d like to download.
After selecting Save File your download will begin to download automatically. Here we can see the status of the download along with two icons to the right of the status bar. The first one is a pause icon and the second a stop sign. Press the pause icon to pause your download and come back to it later. Press the stop icon to completely stop the download.
After pressing the pause icon you will see that the download status stands still. The pause icon is now a play icon and clicking it will begin the download right where you left off.
This screen shot shows the download completed successfully.