Seamonkey has the preference:
Appearance > Content > Aggressively look for web site icons when the page does not define one
If you set that, the icon would have shown for ldraw.org, but it doesn't matter now because the <link> has been added anyway.
(Although I've just noticed, it hasn't been set for the blue icon on the domain forums.ldraw.org)
Appearance > Content > Aggressively look for web site icons when the page does not define one
If you set that, the icon would have shown for ldraw.org, but it doesn't matter now because the <link> has been added anyway.
(Although I've just noticed, it hasn't been set for the blue icon on the domain forums.ldraw.org)