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What is tha latet version of Firefox compatile with MAC OS 10.4.11

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When ever I try to load a new version old Firefox on my G5 running OS 10.4.11 I get a dialog that it is not compatible with my system. Given the above description of my system and configuration what is the latest version of Firefox I should be running. DO NOT TELL ME WHICH I SHOULD NOT BE RUNNING! Failure to answer will send me back to Opera, I promise.

When ever I try to load a new version old Firefox on my G5 running OS 10.4.11 I get a dialog that it is not compatible with my system. Given the above description of my system and configuration what is the latest version of Firefox I should be running. DO NOT TELL ME WHICH I SHOULD NOT BE RUNNING! Failure to answer will send me back to Opera, I promise.

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Firefox 3.6.x is the last version of Firefox available from Mozilla for PPC Macs.

For older Macs that aren't supported in Firefox 4+ versions, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/
http://tenfourfox.blogspot.com/
https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported