Right click has been disable but in firefox and many web browser, you can still can go to Tools > Web Developer > Page Source (or use shortcut Ctrl-U /Command-U). In the DOM and Style inspector, the source code is plainly displayed and the password is commented out as
ZluruAthQk7Q2MqmDeTiUij2ZvWy2mBi
Another way is to intercept the packet to see the source. We’ll use this method for later challenges.
Computer Science Blog 