Firefox not rendering some pages well

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http://unix.stackexchange.com – I recently installed ArchLinux on my macbook Alu. I've installed the nvidia proprietary graphics, and Gnome3. I have Firefox 10 installed with pacman. However Firefox is not rendering some pages well (like in MacOs). The page width outfit the screen size and elements not appearing where they should. Can someone tells me if it comes from my installation or from firefox in general? (I've also tried to disable hardware accelaration but same result). Thank you. (HowTos)