Still cannot increase font size in main window (2021, TBird v91)
It's unbelievable, but this problem continues to exist: How can users make the font used to display the lists of messages and the folder list bigger. This should have a simple, easy tweak in some menu, but alas, that's not true. [Why Mozilla, Why???] So please, if you know a way to do this in 2021, TBird version 91+, please share.
Valgt løsning
Open Config. editor from Preferences/General/Indexing, change the preference layout.css.devPixelsPerPx to 1.0 or 1.25 or 1.5 or 2.0 or 2.5 .... The effect is shown immediately while the editor is open.
https://support.mozilla.org/en-US/questions/1269361#answer-1254162
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Valgt løsning
Open Config. editor from Preferences/General/Indexing, change the preference layout.css.devPixelsPerPx to 1.0 or 1.25 or 1.5 or 2.0 or 2.5 .... The effect is shown immediately while the editor is open.
https://support.mozilla.org/en-US/questions/1269361#answer-1254162
Using Config Editor, you can set scaling to your liking by changing the value of the preference called font.size.systemFontScale
This tweak was posted in the reviews for the add-on you relied on previously here https://addons.thunderbird.net/en-us/thunderbird/addon/theme-font-size-changer-fixed/
Restart Thunderbird after each change of that value for it to take effect.
I have a similar problem with Thunderbird 91.6. Immediately after updating to this version, everything in the main window is nearly twice as big as it was before. I don't need everything to be giant-size, so please put it back how it was before! Changing the setting for 'layout.css.devPixelsPerPx' has absolutely no effect whatsoever.