How can I increase the font size of Thunderbird program, NOT the emails but the program?
For example, the list of my e-mail addresses on the left. And, the listing of e-mails at the top, on the right.
For example, the list of my e-mail addresses on the left. And, the listing of e-mails at the top, on the right.
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It appears you're using macOS, since you posted this question from Safari. Can you confirm this ?
Font size of the application itself would first depend on the operating system desktop theme and configuration.
I'M using MS 10
sfhowes recommended that you try this addon: https://addons.thunderbird.net/en-us/thunderbird/addon/theme-font-size-changer-fixed/ Did using the addon help ?