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How do I downgrade to firefox 7.0 for windows?

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I currently have 8.0, and love it, but it's not compatable with my new work. So, I need to downgrade to 7.0 but can't seem to find anywhere to do such without my system saying that I don't have authorization (eventhough I'm using administrator account).

I currently have 8.0, and love it, but it's not compatable with my new work. So, I need to downgrade to 7.0 but can't seem to find anywhere to do such without my system saying that I don't have authorization (eventhough I'm using administrator account).

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