I turned on my iMac, mounted Firefox and was told it would no longer work - Download and install Firefox4 (FREE) which I did, but now the error message says it's not supported on this architecture. What to do?

Today I turned on my iMac (OSX 10.5.8 1.8GHz PowerPC G5, 1.25 GB DDR SDRAM) mounted Firefox and was prompted to Download and install Firefox4 (FREE) which I did.
I was prompted to replace the previous Firefox with the newly downloaded and now I can't find the old version and the new version says it isn't supported on this architecture. The icon has a zero with a slash across it.
What do I have to do?

Firefox 4 requires at least OS X 10.5 and an Intel Mac.
* http://www.mozilla.com/firefox/4.0/system-requirements/
For an unofficial Firefox 4 compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at:
* http://www.floodgap.com/software/tenfourfox/
Firefox 3.6.x (Mac OS X 10.4 and later) can be found here:
* http://www.mozilla.com/en-US/firefox/all-older.html

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