How can I see the source code of installed Firefox OS apps?
You need to enable debug mode in order to see the real filesystem. Then you can either:
import the content with
adb pull /data data(copies the/datadirectory on your computer);or use the shell
adb shellto get a shell on your phone.
The applications are located in /data/local/webapps. You get one directory per application. Packages apps have a application.zip file containing all the files -js, css, html).