firefox embedded extensions

[Vladimir Timofeev]

How can I build DOM Inspector with www/firefox?

I can (with small edit mozilla/Makefile.common and
mozilla/files/mozconfig-generic.in) insert this line in .mozconfig:
ac_add_options --enable-extensions="default,inspector"

And it compile and install right.

But I can't find inspector in menus.
'firefox -inspector' also don't show inspector window.

What is wrong?