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I downloaded the newest version and there is a Circle with a slash through it over the firefox icon. When I click on it the message is the system does not support this version. How do I reinstall the previous version?

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I updated firefox. When I did there was a circle with a slash (as in No!) across the firefox icon. I clicked on it to open the browser and the error message reads: the application firefox cannot be launched - 10661

How do I go to the previous version that worked just fine?

I updated firefox. When I did there was a circle with a slash (as in No!) across the firefox icon. I clicked on it to open the browser and the error message reads: the application firefox cannot be launched - 10661 How do I go to the previous version that worked just fine?

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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