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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.

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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.

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up vote 1 down vote accepted

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.

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