User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 When you have the preview of Firefox tabs in the Windows 7 taskbar, and you fly over the list too quickly, Firefox crashes. Reproducible: Always Steps to Reproduce: 1. Activate the tab preview in the Windows taskbar via menu Tools > Options then "Tabs" 2. Go over the Firefox icon (mine is pinned) in the Windows taskbar 3. Fly over the list of the tabs but quite quickly (tabs should switch quite fast). Actual Results: Firefox crashes a few seconds after. Expected Results: Firefox don't crash.

Hi, Can you please post the crash id? Can get this easy from about:crashes. Thanks! BTW, this is a WFM on a 32-bit Win 7 machine, with build id: Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20100101 Firefox/4.0

Didn't know about this "about:crashes" feature =) Here *they* are: bp-001153ba-cf0a-4de2-9b83-4ad982110323 - 23/03/2011 13:51 bp-4ebfd63a-fc48-4cbd-8820-22db22110323 - 23/03/2011 13:10 bp-55159c90-b103-46ce-bece-af9bf2110323 - 23/03/2011 12:56

What is "WFM"? The cpu is an "Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66 GHz" and it's effectivement Win 7 Pro 64 bits installed.

WFM means "works for me" and means that the person was unable to reproduce the problem. From your crash reports, the signature is [@ gfxContext::NewPath() ], which has been reported as bug 614772. Marking as a dupe of that one + adding your steps to reproduce there, in the hope that it helps speed up the fixing of the problem. Thanks!

Oh and please could you paste the contents of the graphics section from the about:support page please (use the copy to clipboard button at the top of the page, since copying directly looses line breaks).

Thanks Maxx, Ed

Accélération graphique Description de la carte ATI Radeon HD 3470 - Dell Optiplex ID du vendeur 1002 ID du périphérique 95c0 RAM de la carte 256 Pilotes de la carte atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64 Version du pilote 8.680.0.0 Date du pilote 11-18-2009 Direct2D activé Bloqué par votre pilote graphique. Essayez de mettre à jour le pilote vers la version 10.6 ou plus récente. DirectWrite activé false (6.1.7600.16763, font cache 0,40 MB) Rendu WebGL (WebGL unavailable) Fenêtres avec accélération graphique 0/1