It's #22 top crasher in 10.b6. It's probably related to bug 700288 and bug 722024 as it happens only with AMD Radeon HD 6xxx serie GPUs. Signature xul.dll@0xc584d | nsHTMLScrollFrame::PlaceScrollArea(ScrollReflowState const&, nsPoint const&) More Reports Search UUID 187f5ea1-1df2-40b3-aaeb-f65312120127 Date Processed 2012-01-27 22:54:55 Uptime 1613 Last Crash 26.9 minutes before submission Install Age 13.6 hours since version was first installed. Install Time 2012-01-27 09:19:56 Product Firefox Version 10.0 Build ID 20120123235200 Release Channel beta OS Windows NT OS Version 6.1.7601 Service Pack 1 Build Architecture x86 Build Architecture Info AuthenticAMD family 20 model 2 stepping 0 Crash Reason EXCEPTION_BREAKPOINT Crash Address 0x6c6b584d App Notes AdapterVendorID: 1002, AdapterDeviceID: 9806, AdapterSubsysID: 104c1043, AdapterDriverVersion: 8.880.0.0 D2D? D2D+ DWrite? DWrite+ D3D10 Layers? D3D10 Layers+ Processor Notes This dump is too long and has triggered the automatic truncation routine EMCheckCompatibility True Frame Module Signature [Expand] Source 0 xul.dll xul.dll@0xc584d 1 xul.dll nsHTMLScrollFrame::PlaceScrollArea layout/generic/nsGfxScrollFrame.cpp:723 2 xul.dll nsHTMLScrollFrame::Reflow layout/generic/nsGfxScrollFrame.cpp:886 3 xul.dll nsLineLayout::ReflowFrame layout/generic/nsLineLayout.cpp:853 4 xul.dll nsBlockFrame::ReflowInlineFrame layout/generic/nsBlockFrame.cpp:3802 5 xul.dll nsBlockFrame::DoReflowInlineFrames layout/generic/nsBlockFrame.cpp:3633 6 xul.dll nsBlockFrame::ReflowInlineFrames layout/generic/nsBlockFrame.cpp:3452 7 xul.dll nsBlockFrame::ReflowLine layout/generic/nsBlockFrame.cpp:2536 8 xul.dll nsBlockFrame::ReflowDirtyLines layout/generic/nsBlockFrame.cpp:1962 9 xul.dll nsBlockFrame::Reflow layout/generic/nsBlockFrame.cpp:1051 10 xul.dll nsBlockReflowContext::ReflowBlock layout/generic/nsBlockReflowContext.cpp:294 11 xul.dll nsBlockFrame::ReflowBlockFrame layout/generic/nsBlockFrame.cpp:3173 12 xul.dll nsBlockFrame::ReflowLine layout/generic/nsBlockFrame.cpp:2480 13 xul.dll nsBlockFrame::ReflowDirtyLines layout/generic/nsBlockFrame.cpp:1962 14 xul.dll nsBlockFrame::Reflow layout/generic/nsBlockFrame.cpp:1051 15 xul.dll nsBlockReflowContext::ReflowBlock layout/generic/nsBlockReflowContext.cpp:294 ... More reports at: https://crash-stats.mozilla.com/report/list?signature=xul.dll%400xc584d%20|%20nsHTMLScrollFrame%3A%3APlaceScrollArea%28ScrollReflowState%20const%26%2C%20nsPoint%20const%26%29

The signature summary indicates this is a new signature to B6.

(In reply to Marcia Knous [:marcia] from comment #1) > The signature summary indicates this is a new signature to B6. The one with xul.dll@0xba28d is specific to 10.0b1. See also bug 700288 comment 15.

I'm marking this bug as WORKSFORME as bug crashlog signature didn't appear from a long time (over half year) in Firefox (except some obsolete Fx <11).