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Can I use multiple versions of FireFox on one PC?

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- I use 5.0 for most things - but have need to use FF 3.6 with a web application we are developing that requires me to use 3.6 for testing.

- I use 5.0 for most things - but have need to use FF 3.6 with a web application we are developing that requires me to use 3.6 for testing.

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