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i downloaded the newest ff to a friends imac and the os 10.4.11 won't run it. how do i get back to a version that will work on that computer?

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friends computer had firefox on it and it asked to update... wouldn't work so I went to mozilla and downloaded the newest version to find out it won't work with this os. I need to restore the older version to her computer and don't know how.

friends computer had firefox on it and it asked to update... wouldn't work so I went to mozilla and downloaded the newest version to find out it won't work with this os. I need to restore the older version to her computer and don't know how.

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