This is a tutorial (more like a code dumb) on how to enable the pdf viewer plugin from google chrome in chromium.
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
ar vx google-chrome-stable_current_amd64.deb
rm google-chrome-stable_current_amd64.deb control.tar.gz debian-binary
tar --lzma -xvf data.tar.lzma
sudo cp opt/google/chrome/libpdf.so /usr/lib/chromium-browser/
rm -rf etc opt usr data.tar.lzma