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How do I downgrade to Firefox 3.6 from 4.0 until there is a compatable addon for 1Password?

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Firefox 4 does not support my 1Password add-on and I want to go back to Firefox 3.6 until there is an add-on supported by Firefox 4. How can I revert to the older version?

Firefox 4 does not support my 1Password add-on and I want to go back to Firefox 3.6 until there is an add-on supported by Firefox 4. How can I revert to the older version?

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