Mapping name for profile for use in a bookmark

I think Firefox should provide a mapping that can
be used in a bookmark to refer to the profile directory
in use, which in turn would identify the chrome directory
and the directory above the profile directory and any of
the related files. And another specifically for the cache,
which I think would help with better separation of user
material from temporary data.

I am posting here because I'm sure Firefox Portable
developers can tie in with changes to Firefox and I
see people struggle to find their profile, With a portable application not only does one had to have done that but they also have to deal with the changing of the drive letter on the portable device.

Also that it would be so important to portable applications that it could be done
in Firefox Portable even before it is done in Firefox.