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how do i go back to the previous version of firefox?

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i need to go back to the previous version of firefox in order to do my fasfa for school, the school website says that my version of firefox is to new and is not supported. so i need to know how to go back the the old version.

i need to go back to the previous version of firefox in order to do my fasfa for school, the school website says that my version of firefox is to new and is not supported. so i need to know how to go back the the old version.

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