ugly tabs in firefox

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https://bbs.archlinux.org – Hi,since yesterday, after full system upgrade, I have problem with tabs headers in firefox/thunderbird. Here are example how it look in my firefox. This problem exist if firefox started with fresh profile, without any extension installed. System is arch amd x86_64 with latest kernel,  nvidia card and nouveau driver01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 440] (rev a1) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 83b7 Flags: bus master, fast devsel, latency 0, IRQ 24 Memory at fd000000 (32-bit, non-prefetchable (HowTos)