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firefox4 will not open on a PowerPC G5 runing OS 10.5.8. Dialog box states architecture does not support Firefox 4

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  • 11 have this problem
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  • Last reply by mizalsil

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I downloaded FF4 today and placed the icon in the applications folder. The dialog box stated that the architecture would not support FF4. FF 3.6.16 works fine.

I downloaded FF4 today and placed the icon in the applications folder. The dialog box stated that the architecture would not support FF4. FF 3.6.16 works fine.

All Replies (2)

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Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox

If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com

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It would have been less anxiety producing to have this information prominently on the web site. Fortunately I was able to reinstall 3.6.16 with all my data saved.

Modified by mizalsil