Thunderbird
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- Menu app icon > Options/Preferences > General
- Scroll down to the very bottom
- click on 'Config Editor' button to open 'about:config'
- Accept the risk.
- In search type: pixels
- Look for this line: layout.css.devPixelsPerPx
- Double left click on that line to open the 'Enter string Value' box so you can edit the Value. The default value will be a negative number: -1.0
- Enter a new positive number: 1.3 seems to work for me, then click on OK.
The effect is immediate, so you can modify that number until it looks ok for you. Image below as guide.
