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UPDATED to include the image :)
If you are talking about only reading emails after you open to read or write.
This can be set up:
* 'Menu icon' > 'Options' > 'Options' > 'Display' > 'Formatting' tab
* Choose prefered font.
* Choose size
* Click on 'Advanced' button
* Set all the sizes to prefered size.
* Click on all the 'OK's
see image below.
There is an Addon which offers more choices on font control in general - BUT there have been recent reports that this is addon needs updating.
However, there has been a recent update only a couple of days ago.
Version 64.1
* https://addons.mozilla.org/en-US/thunderbird/addon/theme-font-size-changer-for-tb/
download the addon to your computer. then install the addon following this information:
* https://support.mozilla.org/en-US/kb/add-ons-and-extensions-faq#w_how-do-i-install-an-add-on
Modified January 17, 2018, 12:15:26 AM PST by Toad-Hall