Comment 2 for bug 112829

Thank you keikannui for your report,

Retrace done.

Extract from retraced stacktrace:
...
#3 <signal handler called>
#4 nsLookAndFeel::InitColors () at nsLookAndFeel.cpp:500
#5 nsLookAndFeel::LookAndFeelChanged (this=0x8236480) at nsLookAndFeel.cpp:569
#6 nsPresContext::ThemeChanged (this=0x83d0250) at nsPresContext.cpp:1190
#7 PresShell::HandleEvent (this=0x83ccc98, aView=0x83fcba8, aEvent=0xbfb13bc8,
#8 nsViewManager::HandleEvent (this=0x83cc7d0, aView=0x83cc848, aEvent=0xbfb13bc8, aCaptured=0)
#9 nsViewManager::DispatchEvent (this=0x83cc7d0, aEvent=0xbfb13bc8, aStatus=0xbfb13b70)
#10 HandleEvent (aEvent=0xbfb13bc8) at nsView.cpp:171
#11 nsCommonWidget::DispatchEvent (this=0x83cc8b0, aEvent=0xbfb13bc8, aStatus=@0xbfb13bf8)
#12 nsWindow::ThemeChanged (this=0x83cc8b0) at nsWindow.cpp:1912
...

Tagging as mt-confirm for further processing