I have some big size PDF catalogs at my website, and I need to link these as download. When I googled, I found such a thing noted below. It should open the \"Save As
With large PDF files the browser hangs. In Mozilla, menu Tools → Options → Applications, then next to the content type Adobe Acrobat document. In the Action drop down, select Always ask.
This did not work for me, so what worked was:
Menu Tools* → Add-ons → Adobe Acrobat (Adobe PDF plugin for Firefox) → DISABLE. Now I am able to download e-books!