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I can't reinstall Version 15.01 on my Mac. It was running earlier. Help please.

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I was running Version 15.0.1 on my Mac Powerbook G4 with OS10.5.8 earlier. When I tried to upgrade to Version 17 I couldn't. So I tried to reinstall or download Version 15.0.1. I still get a message telling me that is unsupported on my architecture. How can I get Version 15.0.1 to run again?

I was running Version 15.0.1 on my Mac Powerbook G4 with OS10.5.8 earlier. When I tried to upgrade to Version 17 I couldn't. So I tried to reinstall or download Version 15.0.1. I still get a message telling me that is unsupported on my architecture. How can I get Version 15.0.1 to run again?

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Sadly, I don't know how you got Fx 15 to run on a PowerBook G4. The last version of Firefox that I know is able to run on a G4 is Fx 3.6.28 - more info - so I don't have an info on making Fx 15 work.