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Videos dont play on my computer I have a mac osx 10.3.9 and it says unsupportive operating system i must get tiger or leopard

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i have mac osx 10.3.9 and i must get tiger 10.4 or later to play videos and other things like links in my e-mail won't open, and other problems

This happened

Every time Firefox opened

i have mac osx 10.3.9 and i must get tiger 10.4 or later to play videos and other things like links in my e-mail won't open, and other problems == This happened == Every time Firefox opened

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and ....?