Thanks for this suggestion. I have been having serious delays every time I clicked a link in a PDF. I have had to wait for the stupid pop-up asking if I wanted to allow the link, for EVERY blasted link. "Uhhh Nooooo! I think I clicked that link by mistake… %^&*#)@ @$$^&)*$!" >:( How ridiculous. So on your suggestion, I went to Preferences->Trust Manager->Internet Access from PDF files outside the web browser->Change Settings… and clicked Allow PDF files to access all web sites and now every link opens instantly in my browser just like when I click a link in the browser.
I looked at every setting except this one since it is completely unintuitive to those of us who didn't write the code for Acrobat.