some silly (?) problem with dump

Hi.

Hope this is right place for my question. If not, maybe somebody could 
give me a hint to which newsgroup should I post my question.

The problem is actually with JavaScript dump() command.
For enabling dump output I should enable it in the prefs.
One way could be for doing it in Edit -> Preferences -> Debug (?).. but 
there is no Debug section in Mo1.4 stable release.
the alternative should be that I would open my prefs.js and add a line like
'user_pref("browser.dom.window.dump.enabled", true);'
to there (?) but it already is there.
So the dump function should work fine.
But when I open JavaScript console and type in 'dump("test")' and 
evaluate it... nothing... (As I have understood the output should be 
printed to JavaScript console. Or not?)
Also some xul-aps that should generate dump output do nothing.

What is the major thing I am missing?
Is it impossible maybe to get dump output from a stable release Mo?

Thanks for everybody who bothered to read.

Heiko - a-bit-unlucky

ps. i am using Mo1.4 on WinXP.