Firefox requires 10.5. My mac is osx 10.5.8. Why can't I use the new firefox?

The latest firefox requires osx 10.5. My mac is 10.5.8 but the latest firefox will not run on my mac. I am allowed to download it but it will not function after I download it. With my present firefox I am denied many functions on various sites, particularly on youtube.

http://www.mozilla.com/en-US/firefox/4.0/system-requirements/
Mac
Operating Systems
* Mac OS X 10.5
* Mac OS X 10.6
Recommended Hardware
* Macintosh computer with an '''Intel x86 processor'''
* 512 MB of RAM
* 200 MB hard drive space

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
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Firefox requires 10.5. My mac is osx 10.5.8. Why can't I use the new firefox?

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