QUES: Debian follows the extended support releases ESR of Firefox Support for the 31x series has ended so starting with this update were now following the 38x releases

correct the punctuation.

CORRECTED: Debian follows the extended support releases (ESR) of Firefox. Support for the 31.x series has ended, so starting with this update we're now following the 38.x releases.

QUES: The basic idea of organic farming and processing is to produce healthy food in a sustainable way Therefore the organic berries and fruit growers do not use any chemical pesticides or fertilizers that are used by conventional farmers

correct the punctuation.

CORRECTED: The basic idea of organic farming and processing is to produce healthy food in a sustainable way. Therefore, the organic berries and fruit growers do not use any chemical pesticides or fertilizers that are used by conventional farmers.

QUES: However some manufacturers give some coupon to get some special discounts

correct the punctuation.

CORRECTED:
However, some manufacturers give some coupon to get some special discounts.