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I'm using windowsXP and I had upgraded my older firefox to the new firefox4. But it still looks like the older one. WHY?

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I'm using windowsXP and I had upgraded my older firefox to the new firefox4. But it still looks like the older one. WHY?

I'm using windowsXP and I had upgraded my older firefox to the new firefox4. But it still looks like the older one. WHY?

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Right-click on the Tab strip and un-check Menu Bar.