can't style scrollbars since <scrollbar> isn't in DOM - a regression

"alta88[nntp]" <[email protected]>
Newsgroups gmane.comp.mozilla.devel.dom
Message-ID <[email protected]> 
i filed this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=424184.

the commentary here: https://bugzilla.mozilla.org/show_bug.cgi?id=369676 
seems to indicate UA styling (stylish is UA) should be possible.  it 
certainly should be possible to style scrollbars from usercontent.css 
and userchrome.css.

anyone have insight?
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