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I need to upgrade from 3.09 but do not have intel (i-mac x.5)

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Received alert that I need to upgrade to Firefox 6, but cannot find system requirements in order to do so. I do not have intel on my i-mac, but am running OSX.5 No problem with Firefox 3.09 but understand security is at risk; and it does run very slowly all of a sudden.

Received alert that I need to upgrade to Firefox 6, but cannot find system requirements in order to do so. I do not have intel on my i-mac, but am running OSX.5 No problem with Firefox 3.09 but understand security is at risk; and it does run very slowly all of a sudden.

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The latest version that runs on PPC Mac running OS X 10.5 is the current release version, Firefox 3.6.13.

http://www.mozilla.com/en-US/firefox/system-requirements.html

Firefox 4 will not work on PPC Macs.

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

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Thank you TonyE....that was all it took. Trash old, in with the new!