Theme Font & Size Changer (fixed) 64.6
by Bzzz
Fixed version (no 90 day timer till silent failure) of the popular "Theme Font & Size Changer for Thunderbird" addon
About this Add-on
Also, this addon is compatible with e.g. TB 52 ESR and other versions up to TB57 - use version 64.3 from the archive.
It is beyond me why this addon shows as incompatible with TB52 ESR when there is clearly one version available!