Fonts suddenly shrank on basic screens including account listings in left column and the incoming mail listings in the middle.
Thunderbird worked fine for more than a year. Then suddenly the fonts on the opening screen got smaller. This affects the left column with mail accounts and their folders, as well as the list of emails (subject, sender, etc.). I've tried all the menus and options, but have only succeeded in changing the font size of messages I send or reply to. If this can't be fixed, I'll need to go back to (shudder) Exchange.
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Run TB in safe mode (hold Shift when you launch TB). Any change?