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I had FF 4.0, I want to download Selenium, but it fails saying that it is not compatable to FF4.0

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When I try to download Selenium IDE, it says it is Not Compatible with FF 4.0, Now I cannot go to FF 3.6, as it is not supported,

How can I install Selenium IDE ?

When I try to download Selenium IDE, it says it is Not Compatible with FF 4.0, Now I cannot go to FF 3.6, as it is not supported, How can I install Selenium IDE ?

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Where are you trying to download it from?
See this AMO search.