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If I upgrade my iMac G4 from Tiger OSX 10.3.9 to Leopard OSX 10.5 will Firefox work properly as it will not allow me to upgrade and so I am losing out on much of what Firefox does?

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The message is That I am using an older version of Firefox but I can't upgrade to the most recent version (within the last year) and I am losing the ability to do things. For example, I can't send out emails from Gmail now, the type on the screens of many web sites is squeezed small and some web pages are "scrambled" in appearance. Before I purchase an upgrade to the Leopard OSX 10.5 I would like to know if Firefox works properly with it?

The message is That I am using an older version of Firefox but I can't upgrade to the most recent version (within the last year) and I am losing the ability to do things. For example, I can't send out emails from Gmail now, the type on the screens of many web sites is squeezed small and some web pages are "scrambled" in appearance. Before I purchase an upgrade to the Leopard OSX 10.5 I would like to know if Firefox works properly with it?

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Well, with a PPC Mac you can upgrade as far as Firefox 3.6.19 if you upgrade from Tiger OSX 10.3.9 to Leopard OSX 10.5, but Firefox doesn't support PPC architecture in the latest Firefox 4, 5, and 6.0 versions.

For older Macs that aren't supported in Firefox 4.0 & 5.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/

But, you still need to carefully investigate if your hardware specs are sufficient for either Firefox 3.6.19 or for 10-4Fox.

http://www.mozilla.com/en-US/firefox/3.6/system-requirements/