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How can I download to a version just prior to 4.0?

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Because of incompatibility between Comcast Norton Suite and Firefox 4.0, I need to revert to the version prior to 4.0. I can't seem to find where on your web site to download and install a specific version.

Because of incompatibility between Comcast Norton Suite and Firefox 4.0, I need to revert to the version prior to 4.0. I can't seem to find where on your web site to download and install a specific version.

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