A few days after the launch of the stable version of Mozilla Firefox, a new Beta version of the popular Internet browser has been made available to the public.
Mozilla Firefox 19.0 Beta 1 has been chosen for the implementation of a very important feature, more precisely a built-in PDF viewer.
Up until now, this particular feature was taken care of by third-party plug-ins, but most of the time they were using proprietary closed source code that could potentially expose users to security vulnerabilities.
Andreas Gal and Chris Jones, a couple of developers for Firefox, started a research project called PDF.js. The idea proved to be a good one and it evolved quickly into a full PDF viewer.