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using mac os 10.4, downloaded latest version of firefox only to find that it isn't compatible with this system. how do i get the previous version back?

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Notification for an update appeared, I proceeded with the update, attempted to start up the new version and was told it is not compatible with mac os 10.4, the version I am currently using. How can I get the former version of firefox back so that I can continue using this application?

Notification for an update appeared, I proceeded with the update, attempted to start up the new version and was told it is not compatible with mac os 10.4, the version I am currently using. How can I get the former version of firefox back so that I can continue using this application?

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Thanks for your help.