How to check directory trees made available to proot'ed applications?
  BW_BROWSER_PATH=find ./browser-wrapper /dev
  BW_BROWSER_PATH=bash ./browser-wrapper -c "find /dev /home -maxdepth 3 | xargs ls -aldh"

How to quickly find a Flash application since they tend to disappear?
  Look for "Flash sample clock", it should lead you to
  Of course, other samples are available on

How to quickly find a webGL demo?
  "WebGL Samples" looks like the right place, e.g.:
  Other demos:

How to quickly find a Java applet since, well, you know.
  Looking for "java applet sample" should lead you to