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Hpw to increase font size on my emails (UK)

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Sent a Q requesting how to increase font size on my emails (who from and content of emails totally unreadable). REceived a reply from Matt that I donot understand. I am not a techy, have been using thunderbird for several years, never had a problem with font size. In imple language and step by step please tell me how to. Using Tools, Account Setting has NOT worked for me thank you

Sent a Q requesting how to increase font size on my emails (who from and content of emails totally unreadable). REceived a reply from Matt that I donot understand. I am not a techy, have been using thunderbird for several years, never had a problem with font size. In imple language and step by step please tell me how to. Using Tools, Account Setting has NOT worked for me thank you

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There is a detailed set of instructions here, with pictures:

https://support.mozilla.org/en-US/questions/1356875#answer-1457372

Note that if you are using a version of TB older than 91, start from Tools/Options instead of Tools/Preferences.