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Folder pane and inbox font suddenly changed today

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Thunderbird crashed today (Jan 5), and when I started it up again, the folder pane and inbox were in a new (sanserif) font. The Theme Font & Size Changer add-on didn't work. How do I restore the font I formerly had?

Thunderbird crashed today (Jan 5), and when I started it up again, the folder pane and inbox were in a new (sanserif) font. The Theme Font & Size Changer add-on didn't work. How do I restore the font I formerly had?

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Many people have reported this add-on failing today. You should contact the Add-on "Support Email" for https://addons.mozilla.org/en-us/thunderbird/addon/theme-font-size-changer/ - namely [email protected]

Note, most addons have a support links/contact listed on their addon page.