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How to download Firefox 56

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Firefox 57 has been a DISASTER!! To do what I need to do with my browser,which requires the needed add-ons, I need version 56. Where can I get that version?

Firefox 57 has been a DISASTER!! To do what I need to do with my browser,which requires the needed add-ons, I need version 56. Where can I get that version?

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Please do not start a new question every 20 minutes that is basically the same. Let's continue here: https://support.mozilla.org/questions/1187308