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pop up asked me to download latest version, now disabled?

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A window popped up asking to download the latest version of firefox. Usually say no, not having time, but this time said yes. Operating system is Mac OS X 10.5.8 with 512 MB, which is recommended. However, got to the drag and drop into Apps part of the download and there's a big circle and slash through firefox and when I try to start firefox it says "You cannot open the application "Firefox because it is not supported on this architecture". Now when I go to firefox website, it says that the latest version is not supported by my operating system...? How do I fix this? Don't make me use Safari - it's too slow to deal with. Thank you!

A window popped up asking to download the latest version of firefox. Usually say no, not having time, but this time said yes. Operating system is Mac OS X 10.5.8 with 512 MB, which is recommended. However, got to the drag and drop into Apps part of the download and there's a big circle and slash through firefox and when I try to start firefox it says "You cannot open the application "Firefox because it is not supported on this architecture". Now when I go to firefox website, it says that the latest version is not supported by my operating system...? How do I fix this? Don't make me use Safari - it's too slow to deal with. Thank you!

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Sorry, PowerPC Macs aren't supported in Firefox 4 and later versions.

For older Macs that aren't supported in Firefox 4.0 & 5.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/

Or use Firefox 3.6.x which is the last version from Mozilla for your configuration.
http://www.mozilla.com/en-US/firefox/all-older.html