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The message says it is not supported by this archetecture.

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After downloading Firefox to my Mac 10.411 laptop the Firefox symbol shows a no symbol and when you try to open it you get the message that it is not supported by this architecture. What can I do to get Firefox on this computer?

After downloading Firefox to my Mac 10.411 laptop the Firefox symbol shows a no symbol and when you try to open it you get the message that it is not supported by this architecture. What can I do to get Firefox on this computer?

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Is that a PPC Mac?

For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/
http://code.google.com/p/tenfourfox/downloads/list

Or use the older Firefox 3.6.22
http://www.mozilla.com/en-US/firefox/all-older.html