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I need a different version of Firefox for work. 4.0 isn't working correctly with my work program and I don't know how to download an older version.

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I have an online job that requires me to use a different version of firefox. My computer already has 4.0 on it and I need to know how to change it to an older version so I can use it for work.

I have an online job that requires me to use a different version of firefox. My computer already has 4.0 on it and I need to know how to change it to an older version so I can use it for work.

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