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I downgraded from Firefox 4 to 3.17 due to issues with slow running,etc. My stumbleupon has disappeared from my toolbar, and it will not let me reinstall. Help, please? Thanks all.

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Stumble has disappeared from my toolbar, and when I try to reinstall it, it tells me it can't and to reference error 203, I think. I do not know how to fix this, and hope someone can help. Many thanks.

Stumble has disappeared from my toolbar, and when I try to reinstall it, it tells me it can't and to reference error 203, I think. I do not know how to fix this, and hope someone can help. Many thanks.

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