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Starting with Firefox 3, the Windows security settings for downloading applications and other potentially unsafe files from the Internet are honored on files downloaded by the Download Manager. This allows, for instance, system administrators to block executable files from being downloaded by Firefox. This preference allows Firefox to ignore those OS-wide security checks.

Starting with Firefox 3.6, this preference is no longer used.

Possible values and their effects


Do not use Windows’ IAttachmentExecute interface when downloading files, ignoring the security settings for downloads.


Use IAttachmentExecute when available (Windows XP SP1 and newer). (Default)

First checked in

2008-10-11 by Jim Mathies

Has an effect in

Related bugs

Related preferences

See also

External links