Crash reporter creates files on host

I've noticed that that there are some files created by Firefox Portable in the default user directory in Windows.

These belong to the new Mozilla Crash Reporter (http://kb.mozillazine.org/Breakpad), and there are also some extension folders created. That knowledge base article suggests a way to disable the crash reporter, but should this not be done by default to make the app truly portable (ie not leave data on the host)?