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After the latest Thunderbird upgrade all of the font sizes went smaller - how do I get them larger throughout Thunderbird?

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I have Thunderbird version 52.5.2 - How do I change the font size everywhere except message body (that is not the problem)? Help

I have Thunderbird version 52.5.2 - How do I change the font size everywhere except message body (that is not the problem)? Help

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You were probably using the Theme Font & Size Changer and it stopped working on 5th Jan.

https://support.mozilla.org/en-US/questions/1198320