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I need Firefox 10.0 or 19.25 instead of 24.0, how do I get a different version?

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Firefox version 24.0 is not compatible with a website I frequent. I was told I need to use FIrefox 10.0 ,19.25 or Explorer 9.0 for the documents to be compatible. How do I download a different version of Firefox?

Firefox version 24.0 is not compatible with a website I frequent. I was told I need to use FIrefox 10.0 ,19.25 or Explorer 9.0 for the documents to be compatible. How do I download a different version of Firefox?

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In what way is Firefox not compatible with that website?

Is that a problem with the user agent that is detected wrongly?