This question has more than likely been answered a half dozen times in the 58,407 posts on this thread. Assuming a half dozen answers in 58,407 posts, it has then been viewed a minimum of 516 times in the 1,159,533 views.

Anyway, why is it my Mac doesn't open PDF documents on Deltanet when I use Firefox, but when I open the link using Safari, it opens it with no problem at all? Simple change of setting, or is it a compatiblity issue between Deltanet & Firefox?

Thanks for the responses in advance,

GJ