Hello, Recently I noticed this exact problem when using Iceweasel inside an Xvnc4 session. It happens on certain websites only, or when certain actions are performed. For example dragging or resizing a window above the Iceweasel's window can often cause the crash.
Dominique, did you test older versions of libcairo2, and if so, did you find which is the latest older version without this problem? I think I'll have to downgrade, because Iceweasel is pretty much unusable with the current one. -- With respect, Roman
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