ADN

For those of you using Chromium you might notice that when you click on a PDF it asks you to save instead of viewing. It is missing a plugin that is in Chrome.

This is only for Linux. Don't know about Chromium in Windows.

copy the plugin to destination folder:
(note: /usr/lib/chromium-browser is valid for my Ubuntu PPA version, might be /opt/chromium-browser or something on other distributions)
cp /opt/google/chrome/libpdf.so /usr/lib/chromium-browser/
restart any open Chromium processes
check about:plugins for the Chrome PDF Viewer, should not need any enabling

I use Comodo Dragon in Windows. It's made from the open source Chromium. I didn't install any plug-ins and it will open a PDF in some sort of special interface. I can save it from there.

Great tip 5829, should come in handy when I get back to using Mint...