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As you can see in the screenshot, firefox renders some fonts wrong, look at the "Welcome to Arch" box, the twelfth word (flexible) is an example, the "l" is on top of the "e"... and there are more cases in that box.
I don't know if this is bug but I wanted to let you guys know, I'll file a bug if necessary.
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I can confirm I have the same font problems in Firefox. I am using DejaVu Sans.
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I'm using DejaVu sans too and it seems that's currently the only font having the problem...
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It's this one you're seeing:
http://bugs.archlinux.org/task/6087?histring=firefox
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It's probably the same, although it happens with more letters than just the "ffe" like that bug describes.
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