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I want to use "delicious" and it says I can't use Firefox 4.0.1 - how can I go back to my old Firefox?

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I want to go back to the older version of Firefox so I can use "delicious". I can't install the button for Delicious because it says it's not compatible with Firefox 4.0.1 help!!!

I want to go back to the older version of Firefox so I can use "delicious". I can't install the button for Delicious because it says it's not compatible with Firefox 4.0.1 help!!!

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