Font downloads must be disallowed (Restricted Site zone).
It is possible that a font could include malformed data that would cause Internet Explorer to crash when it attempts to load and render the font. Download of fonts can sometimes contain malicious code. Files should not be downloaded from restricted sites. This policy setting allows you to manage whether pages of the zone may download HTML fonts.
Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> “Allow font downloads” to “Enabled” and select “Disable” from the drop-down box.