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Font size changed to very small. I've read all the replies so far nothing works. Theme changer does not seem to work either.

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Font size in incoming mail suddenly changed to very small. I've tried everything in tools. I'm not computer savey enough to go into the guts and change files. Getting really frustrating. I'm using Win7, 32 bit. My other computer is Win7, 64 bit and it has the same problem.

Font size in incoming mail suddenly changed to very small. I've tried everything in tools. I'm not computer savey enough to go into the guts and change files. Getting really frustrating. I'm using Win7, 32 bit. My other computer is Win7, 64 bit and it has the same problem.

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Is this the text in messages themselves, or in the list and menus?

Message text size is easy to adjust. Menus and lists, such as the Inbox, are not so easy.

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Did you read this one? It seems to work for other people. https://support.mozilla.org/en-US/questions/1213044