I have a Mac 10.5.8, but even though that meets system requirements, firefox is telling me Firefox 4 is incompatible. what gives?

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The part you missed is the need for '''Intel''' hardware as you have a PPC. http://www.mozilla.org/en-US/firefox/8.0/system-requirements/
As of Firefox 4.0 and newer only the Intel is supported as the PPC was dropped and 64-bit was put in place with the 32-bit version.
For PPC Macs there is two options. Either you can use the current 3.6.* version from http://www.mozilla.org/en-US/firefox/all-older.html which you have.
Or you can try a third-party version of Firefox 8.0 from http://www.floodgap.com/software/tenfourfox/
However do see http://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported if you use this version.

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