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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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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.

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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