I want to be able to have a maximum-detail log of all
the https traffic between my browser and the outside world.  By
this I mean that the browser writes to a log file *everything* it
sends to the outside (before encryption!), and likewise, writes
*everything* it gets from the outside (after decryption) to the
same file.

In other words, I want to use Mozilla to snoop on my own traffic,
and in particular, my own secure-layer traffic.

I've heard that it is possible to set certain switches during the
building of Mozilla that would enable such full-detail logging.
If this is so, could someone tell me were I can read more about
such switches, and how to set them during the build?

Alternatively, if configuration switches won't accomplish what I
want, can someone direct me to the source files (in the HUGE Mozilla
distribution) that I would need to hack to achieve this functionality?

Answers on either tack (configuration switches or source code hacking
are acceptable), but they have to be very explicit.  (I've never built,
let alone hacked, Mozilla.)

This might be the type of thing you are after:
http://www.mozilla.org/quality/embed/plans/nsIWebProgListTP.html

You can definitely snoop on your headers by using this:

http://livehttpheaders.mozdev.org/

As for actual data, you will almost certainly need to rebuild Moz -
the other option, packet capture at the OS level, will only show the
encrypted traffic.

--seizer-ga