I tried building libxul with symbols... however, it apparently strips them without me asking it to. So, heres a bunch of error messages:

WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 1024
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 964
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 964
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 964
WARNING: Failed to lock profile.: file EmbedPrivate.cpp, line 639
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 964
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 964
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910

(hildon-desktop:23650): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width 0 and height -8

(hildon-desktop:23650): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width 0 and height -14
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: NS_ENSURE_TRUE(compMgr) failed: file nsComponentManagerUtils.cpp, line 165
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 910
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 964
WARNING: NS_ENSURE_TRUE(compMgr) failed: file nsComponentManagerUtils.cpp, line 90
WARNING: XPCOM objects created/destroyed from static ctor/dtor: 'gActivityTLS != BAD_TLS_INDEX && NS_PTR_TO_INT32(PR_GetThreadPrivate(gActivityTLS)) == 0', file nsTraceRefcntImpl.cpp, line 964
WARNING: NS_ENSURE_TRUE(compMgr) failed: file nsComponentManagerUtils.cpp, line 165
###!!! ASSERTION: You can't dereference a NULL nsCOMPtr with operator->().: 'mRawPtr != 0', file ../../../../dist/include/xpcom/nsCOMPtr.h, line 868

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb6b86720 (LWP 23650)]
0xae175348 in ?? () from /usr/lib/xulrunner-1.9b5/libxul.so
(gdb) bt
#0  0xae175348 in ?? () from /usr/lib/xulrunner-1.9b5/libxul.so
#1  0x00000000 in ?? ()