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I've experienced it with a Polish site: http://www.onet.pl. There are normally some gadgets forming a left column -- most browsers under most systems display it correctly but Firefox under Arch doesn't. Finally I found a solution: the problem is due to Firefox identifies itself as a 'Namoroka' and numerous websites cannot identify such useragent. The solution is:
Type 'about:config' in the URL bar, ignore the warning, search for 'general.useragent.extra.firefox' then change 'Namoroka' to 'Firefox'
Hope this tip may be useful for someone.
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I FireBrand my firefox with each new release, usually. Fixes all of that stuff and gives me the right icons to boot.
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