Credit and thanks to OscarCP for post #2382483 in the MacOS Forum concerning Thunderbird email program tiny text font sizes, and a fix to increase the size to a more comfortable reading level. I would like to add an additional item to consider for increasing the text size in Thunderbird. Using the Config Editor, (see 3 pictures below) which is like Firefox about:config, there is a Preference Name: font.size.systemFontScale that scales the overall size of text fonts. The default value is 100, and if Double-Clicked it can be modified to a larger value, I use 125 and everything is bigger and easier to read. Note that this preference change does not take effect until Tbird is closed and relaunched, unlike the fix OscarCP documents in his post, where changing the value is immediately noticed. This change may take some experimentation to find a comfortable value, do not go Too Big to start, because too large can ( and probably will ) cause problems. Try increasing 100 in steps of 10 to see what works for you, I like 125. Note that I use Thunderbird in Windows 10 version 21H1, both Thunderbird version 68.12.1 and version 78.12.0 – and both modified preferences seem to work OK in both versions. Possibly these about:config Preference Name modifications will work for others with no problems, but probably will require some experimentation depending on your screen resolution and display settings, try one or both, and remember to start small and work up to comfortable view. Also, maybe someone can please report if they work OK in MacOS and Linux distros, and what number values did you use, thank you. P.S. screenshot pictures are appreciated also, thanks.
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