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"Theme Font & Size Changer for ThunderBird"
in version 68.6.0 or build and apply a patch to enable it for all revisions 68.0 plus going forward.
Another idea would be great is to incorporate it within the Tools/Options/ Drop-Down under General or Display
providing jus the ability to change Font and Size for the
displayed text within the panes for listing Folders and Messages ( Inbox/Sent/etc,etc. )
Many of us senior users of Mozilla for decades wearing glasses
are having a hard time with the small font size.
Many thanks for all the great work.
Stay Safe and Shelter in place.