Does Firefox depend on xulrunner? Should it?

Hi,
I just got a broken firefox after upgrading to ff28.
I've seen this before, ff complains that it cannot find XPCOM.
I solved it by upgrading manually xulrunner. I'd have thought this would mean that ff depends on xulrunner, doesn't it?
Cheers,
Charlie

No.
expac -Q '%D' firefox
gtk2 mozilla-common libxt startup-notification mime-types dbus-glib alsa-lib desktop-file-utils hicolor-icon-theme libvpx libevent nss hunspell sqlite
Did you do a full upgrade when firefox version was bumped?

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<u>edit information copied from System Info troubleshooting: </u>
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Does Firefox depend on xulrunner? Should it?

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