Description of problem:
I'm not sure what's going on here.  Thunderbird does this several times a day, but doesn't actually crash.  All I know is that ABRT is asking me to report it.  So here we are with a report.

Version-Release number of selected component:
thunderbird-17.0.6-1.fc18

Additional info:
reporter:       libreport-2.1.4
backtrace_rating: 4
cmdline:        /usr/lib64/thunderbird/thunderbird
crash_function: do_winsys_init
executable:     /usr/lib64/thunderbird/thunderbird
kernel:         3.9.4-200.fc18.x86_64
runlevel:       N 5
uid:            431

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 do_winsys_init at radeon_drm_winsys.c:204
 #1 radeon_drm_winsys_create at radeon_drm_winsys.c:582
 #2 create_screen at target.c:11
 #3 dri2_init_screen at dri2.c:807
 #4 driCreateNewScreen at ../../../../src/mesa/drivers/dri/common/drisw_util.c:69
 #5 driswCreateScreen at drisw_glx.c:672
 #6 AllocAndFetchScreenConfigs at glxext.c:758
 #7 __glXInitialize at glxext.c:859
 #9 GetGLXPrivScreenConfig at glxcmds.c:174
 #11 glXChooseVisual at glxcmds.c:1195