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Can I have more than 1 version of FF installed on my machine? (i.e. for testing or to use a web based service that hasn't updated to be compatible with FF5 yet)

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I have FF5 installed, however there is a web based program that I must use for work every day that doesn't yet support FF5. I am wondering if it is possible to have more than 1 version of FF installed on my machine at a time so that I can use like, FF4 for this program but FF5 for regular browsing.

I have FF5 installed, however there is a web based program that I must use for work every day that doesn't yet support FF5. I am wondering if it is possible to have more than 1 version of FF installed on my machine at a time so that I can use like, FF4 for this program but FF5 for regular browsing.

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