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I let ver 5.0 replace 4.0, says can't use version. How do I get 4.0 back

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I saw 5.0 upgrade on home page, I leapt without looking. Let it replace 4.0, Then I find it telling me I can't use it with OX 10.4.11 only 10.5 and above. I went to mozilla home page and tried to download Firefox 4.0 and got 5.0 again. I would like to get a version of Firefox back to use on my MacBook Pro OX 10.4.11. Can you help?

I saw 5.0 upgrade on home page, I leapt without looking. Let it replace 4.0, Then I find it telling me I can't use it with OX 10.4.11 only 10.5 and above. I went to mozilla home page and tried to download Firefox 4.0 and got 5.0 again. I would like to get a version of Firefox back to use on my MacBook Pro OX 10.4.11. Can you help?