# Pastebin JiaUzNaL (rr) bt 5 #0 0x00007f23bd716593 in operator&=(nsFrameState&, nsFrameState) (aLeft=@0x7f239ac97040: 39131620988421122, aRight=-4194305) at /home/emilio/src/moz/gecko-3/layout/generic/nsFrameState.h:46 #1 0x00007f23bd71946e in nsIFrame::RemoveStateBits(nsFrameState) (this=0x7f239ac96fe8, aBits=NS_STATE_IS_HORIZONTAL) at /home/emilio/src/moz/gecko-3/layout/generic/nsIFrame.h:2059 #2 0x00007f23bda9879e in nsBoxFrame::AttributeChanged(int, nsAtom*, int) (this=0x7f239ac96fe8, aNameSpaceID=0, aAttribute=0x7f23b2f329f0 , aModType=2) at /home/emilio/src/moz/gecko-3/layout/xul/nsBoxFrame.cpp:983 #3 0x00007f23bd70eb77 in mozilla::RestyleManager::AttributeChanged(mozilla::dom::Element*, int, nsAtom*, int, nsAttrValue const*) (this=0x7f238d49c900, aElement=0x7f239a889d30, aNameSpaceID=0, aAttribute=0x7f23b2f329f0 , aModType=2, aOldValue=0x7ffd020f4480) at /home/emilio/src/moz/gecko-3/layout/base/RestyleManager.cpp:3427 #4 0x00007f23bd6e9349 in mozilla::PresShell::AttributeChanged(mozilla::dom::Element*, int, nsAtom*, int, nsAttrValue const*) (this=0x7f2388fdf000, aElement=0x7f239a889d30, aNameSpaceID=0, aAttribute=0x7f23b2f329f0 , aModType=2, aOldValue=0x7ffd020f4480) at /home/emilio/src/moz/gecko-3/layout/base/PresShell.cpp:4284 (More stack frames follow...) (rr) p DumpJSStack() 0 inheritAttribute(list = .scrollbutton-up,orient,[part=scrollbox],orient,.scrollbutton-down,orient, attr = "orient") ["chrome://global/content/customElements.js":384:17] this = [object XULElement] 1 initializeAttributeInheritance() ["chrome://global/content/customElements.js":352:17] this = [object XULElement] 2 connectedCallback() ["chrome://global/content/elements/arrowscrollbox.js":144:11] this = [object XULElement] 3 anonymous([object Event]) ["chrome://global/content/customElements.js":219:20]