How to get rid of the File Access Security Warning for EXEs downloaded with Firefox 26+?

Question

When downloading an executable file in Firefox (26) windows shows the "File Access - Security warning". Since I am not stupid and don't try to execute downloaded files I don't trust and clearly don't need to be asked again every time I download something I'd like to disable this annoying warning.

Answer 1

For when setting browser.download.saveZoneInformation to false doesn't seem to work, one can try applying the following .reg file:

Windows Registry Editor Version 5.00

; Do not preserve zone information in file attachments
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments]
"SaveZoneInformation"=dword:00000001

Verified to work on Firefox 31, without rebooting the system, and even without restarting Firefox.

For information on the SaveZoneInformation Group Policy registry setting, see https://support.microsoft.com/kb/883260.

Answer 2

As mentioned in this bugzilla entry, there is a new about:config option that controls this behavior. Setting browser.download.saveZoneInformation to false disables it.