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can I get the older version it says the new version is not supported on this architecure, Im on a mac OS X 10.5.8

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I downloaded the newest version of Firefox and told it to replace the old version. now Firefox won't open gives the error message Firefox is not supported on this architecture. Can I get the older version back? It worked fine. Mac info below

Model Name:	Power Mac G5
 Model Identifier:	PowerMac7,3
 Processor Name:	PowerPC G5  (3.0)
 Processor Speed:	2.5 GHz
 Number Of CPUs:	2
 L2 Cache (per CPU):	512 KB
 Memory:	8 GB
 Bus Speed:	1.25 GHz
 Boot ROM Version:	5.1.8f7
I downloaded the newest version of Firefox and told it to replace the old version. now Firefox won't open gives the error message Firefox is not supported on this architecture. Can I get the older version back? It worked fine. Mac info below Model Name: Power Mac G5 Model Identifier: PowerMac7,3 Processor Name: PowerPC G5 (3.0) Processor Speed: 2.5 GHz Number Of CPUs: 2 L2 Cache (per CPU): 512 KB Memory: 8 GB Bus Speed: 1.25 GHz Boot ROM Version: 5.1.8f7

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Firefox 3.6.x is the last available from Mozilla for PPC Macs.
http://www.mozilla.com/en-US/firefox/all-older.html


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