Hello,

Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• In Firefox 29.0 and above, click the menu button , click Help and select Restart with Add-ons Disabled.
• In previous Firefox versions, click on the Firefox button at the top left of the Firefox window and click on Help (or click on Help in the Menu bar, if you don't have a Firefox button) then click on Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

I placed Firefox 31.3 for the Mac in Safe mode and the same thing occurred. Going to download Itunes from https://www.apple.com/ca/itunes/download/ it goes through the steps for file placement but does not show in the downloads of Firefox and does not appear to download.

mace2 said

Using my Mac OS mountain lion and Firefox ver 31.3 ESR when I download Itunes from https://www.apple.com/ca/confirm/itunes/thankyou.html It appears to go to Apples network 10.x.x.x but does not download and the download indicator shows no visible downloads proceeding.

To correct this issue which seem to only occur for Itunes download.

Symptom: attempted download of Itunes appears to start and you can few data from being downloaded from the site but the file never appears once it completed and you do not see any download activity in the display download icon.

Firefox reset corrected the issue