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I need 3.6.19 for school and have 6.o beta what do I do

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I have the current beta's for firefox, and Aurora, BUT my school that is online only does 3.6.19 and it doesn't work correctly with their version, how do I put another firefox of their type on my computer and still retain 6.0 and Aurora?

I have the current beta's for firefox, and Aurora, BUT my school that is online only does 3.6.19 and it doesn't work correctly with their version, how do I put another firefox of their type on my computer and still retain 6.0 and Aurora?

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You could try the portable version of 3.6.

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