Can't get Firfox to launch after download, how can I get back to old system

was happy with system 3+, notice came for upgrade to four, downloaded, replaced old system, hit button to launch, keeps telling me Firefox cannot be launch because it not supported on this system

Leonard,
Welcome to Apple Discussions!
Like Mike said, repairing permissions after an upgrade
is recommended.
Also, where are you launching Safari from?
The Dock?
or from the Safari icon within the Applications Folder?
If from the Dock, try the icon in your Applications folder.

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