Purpose of XPCOM.

[Doug Chartier]

Why does Mozilla use XPCOM?  A while ago, I read a message in this
newsgroup  indicating that XPCOM's purpose was to allow one to create
components, accessible through interfaces.  I agree that this scheme
is good, but one can accomplish this goal using standard abstraction
techniques in standard C and C++.  Can someone explain the benefits of
XPCOM?

Thanks!