It is available, while the non-portable version is not.I've provided hints on how to install portable Firefox ESR version 52 for two reasons. How to install portable Firefox ESR version 52įirefox ESR (Extended Support Release) version 52, 32-bit, is an legacy version of Firefox that should not be used except to run the tutorial and Protein Explorer, because it lacks security features of later Firefox versions. If you're a Mac user, your current version of Safari may be good enough. The sure choice for Windows users is to install a legacy version of Firefox that still supports Java applets. It may run on Safari for Mac OS X, I'm not sure. It also will not run on Internet Explorer (for another reason). Protein Explorer will not run on the current version of Firefox, Chrome, and Safari for Windows. Unfortunately, Protein Explorer is a Java applet, and a couple of years ago, browsers began removing support for Java applets. There are other protein visualization apps, but this one in particular is needed to run the tutorial, and no other that I'm aware of allows you to manipulate the display without complications. The app also serves as the basis of a very helpful online tutorial about protein structure. We will be using a web application called Protein Explorer to make protein three dimensional structures visible and allow you to alter the display. How to install portable Firefox ESR version 52.