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Install an older version of Firefox - Mozilla SupportMethod 1: Download older versions directly from Mozilla � Launch the older Firefox version you just downloaded. � Click on the hamburger menu. 1 (US English) Firefox bit (US English) Firefox bit (US English). Firefox � 2 (US English) Firefox bit (US English). Firefox 5 through 9 � Firefox 10 through 16 � Firefox 17 through 23 � Firefox 24 through 30 � Firefox 31 through 37 � Firefox 38 through