Chrome displays PDF files natively inside the browser via a closed-source libpdf library. This library is naturally not included in Chromium, the open source brother of Chrome. Can one achieve the same functionality with Chromium?
If one wants to display PDFs inline with Chromium too, one technique is to extract libpdf library from Chrome:
mkdir /tmp/xyzzy && cd /tmp/xyzzy wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb ar vx google-chrome-stable_current_amd64.deb tar --lzma -xvf data.tar.lzma sudo cp ./opt/google/chrome/libpdf.so /usr/lib/chromium/ cd $HOME && rm -rf /tmp/xyzzy
After a restart of Chromium, one can go to about:plugins to check whether the libpdf plugin is well recognised and enabled.
Now PDF files should get open inside the browser.